School Science Lessons
Appendix A, Chemical compounds by chemical name
Chemical names used in this document are usually the standard names followed by synonyms. These names were checked with "Education Queensland (Australia) Aspects of Science management: A reference manual for Schools" 1997.
2014-11-22 sp
Please send comments to: J.Elfick@uq.edu.au

Table 1.0.0
See 7.2.2:
Elements and chemical reactions | See 19.4.0 Food chemistry | E number = food additive
Chemical Name
Molecular formula, synonyms or similar or mineral, (notes on use)
Acetic anhydride







Acetic anhydride, (CH3CO)2O, highly volatile liquid, irritating odour because acetic acid forms by reaction with moisture in air, corrosive to skin, eyes and gut, low toxicity because converts to acetic acid, natural component of the human diet. With water becomes acetic acid by hydrolysis, heat is evolved, but the reaction catalysed by the acetic acid formed is not dangerous if < 25 mL used. Prepare acetate esters from alcohols by reaction with acetic anhydride. Reactions with water hazardous, with alcohols vigorous if acid catalysts present, with boric acid, chromium (VI) oxide, permanganate salts, nitric acid and metal peroxides may be explosive.
Acetic acid










Acetic acid, CH3CO2H, CH3COOH, ethanoic acid, weak acid, Ka small, colourless, mobile liquid, r.d. glacial acetic acid, 17 M, 1.05 gm cm-3, b.p. 118oC, solidifies 16.7oC, conc. 17.5 M, dilute 6 M, miscible with water, pungent odour, "glacial" ethanoic acid, (vinegar, eisel, is about 5% acetic acid, sour wine), E260, (anti-bacterial medicine, clean toilets, stain remover, dissolves grease, mild disinfectant). Common names: white vinegar, (5%). Vinegar is a weak 4-5 % solution of acetic acid, C2H4O2. Pure acetic acid is a colourless liquid that solidifies to ice like crystals in cold weather so is called glacial acetic acid. It is a weak acid, but, like citric acid and tartaric acid, it forms carbon dioxide with chalk, baking soda, and forms hydrogen with iron filings and zinc. Acetic acid is used in the manufacture of artificial silk, “non-flam” celluloid. By treating copper with acetic acid in the presence of air a green-blue pigment forms called verdigris, i.e. impure copper acetate.
Acetone









Acetone, CH3COCH3, (CH3)2C=O, dimethyl ketone, 2-propanone, clear colourless volatile liquid, characteristic smell, inflammable, r.d. 0.79 gm cm-3, b.p. 56.5oC, miscible with water and ether and oils, sharp sweet taste, characteristic odour, solvent for resins, primers, plastics, UN CAS No 1090. Acetone is a curing agent for epoxy resin adhesives, surface coating, irritant. Use in fume cupboard or use < 50 mL in a well-ventilated area. Acetone react violently with chloroform. Use ethyl acetate or methyl isobutyl ketone as alternative solvent to acetone. Heat acetone on a water bath not on a naked flame. Junior secondary students should use acetone only as a cold solvent, and not react or heat acetone. Acetone dissolves polystyrene packing pieces rapidly by dissolving the linking units. Common names: Nail polish remover, (not in Australia), e.g. "Cutex", paint remover, paint thinner, (more acetone per volume), may be sold as "pure acetone".
Aluminium oxide





Aluminium oxide, Al2O3, alumina, corundum, amphoteric oxide, almost insoluble in water, (used for leaching minerals), Lung irritation, Toxic if inhaled, alumina, (porcelain), amphoteric, corundum, (hardness 9, abrasive, sand paper, in red ruby, in blue sapphire), diamantine, emery powder, (abrasive), corroded aluminium, (bauxite, hydrated aluminium oxides Al2O3.nH2O + laterite), alumina hydrate for craft, alumina has amorphous or crystalline state in corundum and bauxite powder used for thin-layer chromatography plates Low cost from pottery supplies store.
Aluminium potassium sulfate


Aluminium potassium sulfate dodecahydrate, AlK(SO4)2.12H2O, alum, potassium alum, potassium aluminium sulfate dodecahydrate, kalinite, hydrated aluminium potassium sulfate, aluminium potassium sulfate 12-hydrate, a double sulfate of aluminium, the "alum" sold at grocery shops. It is very astringent and is used for purifying water.
Aluminium sulfate

Aluminium sulfate octadecahydrate, Al2(SO4)3.18H2O, wrongly "alum", E520, foam agent in fire extinguishers, water filter powder, flocculation agent, food additive E520, modifier, precipitator in sewage treatment, mordant, paper sizing, for 0.l M solution, 66 g of hydrated salt in 1 L water.
Ammonium carbonate






Ammonium carbonate, (NH4)2CO3, sal volatile, aromatic spirits of ammonia, hartshorn salt, ammonium sesquicarbonate, bakers' ammonia, crystal ammonia, colourless crystals or white powder, ammonia-like odour, very soluble, decomposes in hot water, E503, (commercial ammonium carbonate is double salt, ammonium hydrogen carbonate, (ammonium aminomethanoate, carbamate), NH4HCO3.NH2COONH4, that releases ammonia, in sal volatile, smelling salts). Ammonium carbonate is a white powder and is fairly soluble in water to form a weak alkali. It is sold in small bottles as "smelling salts" to revive a fainting person by sniffing the ammonia gas formed from the ammonium carbonate in the bottle. Common names: bakers' ammonia
Ammonium chloride

Ammonium chloride, NH4Cl, salmiac, sal ammoniac, colourless, odourless, cubic crystals or crystal mass, white granular powder, sublimes without melting, weakly hygroscopic, saline taste, (soldering flux, dry cell flux in torch battery), the mineral occurs in burning coal piles and volcanoes.
Ammonium dichromate






Ammonium dichromate, (NH4)2Cr2O7, ammonium bichromate, orange-red monoclinic crystals, heat decomposes, (Not "ammonium bichromate"). The hazardous properties of this salt are similar to those of other soluble chromate and dichromate salts. Ammonium dichromate, along with other yellow chromate and orange dichromate salts is believed to be carcinogenic. An ammonium dichromate is unusual in that it undergoes an exothermic decomposition on heating to form green chromium (III) oxide, nitrogen gas and water. Start the reaction with a lighted match. The reaction continues because it is exothermic. This reaction is not dangerous if only small quantities of material are used. The reaction is dangerous if particles of undecomposed ammonium dichromate are projected into the air and inhaled. Ammonium dichromate is often used in "volcano" experiments.
Aniline





Aniline, C6H5NH2, phenylamine, aminobenzene, (phenylammonium ion, anilinium ion, C6H5NH3+), aniline oil, clear, oily, liquid, colourless, but the colour darkens to brown red, distinct odour and taste, poisonous vapour, acute toxicity, inflammable, b.p. about 182oC, flash point about 70oC, store in dark secure bottles. Phenylamine can be used in lava lamps because it has the same density as water and is not soluble in water. So it rises when heated by the incandescent bulb below and falls when cooled by air at the surface.
Anthraquinone



Anthraquinone, C14H8O2, (9,10-dioxanthracene), light grey crystal or powder, (in plant pigments, cochineal, alizarin red), (laxative in senna pods, cascara, rhubarb), Anthraquinone-2-sulfonate, sodium anthraquinone-2-sulfonate, Harmful if ingested
Aqua regia



Aqua regia, "royal water", [1 part concentrated HNO3 + 3 parts concentrated HCl], [3:1 (v/v) HCl/HNO3], [commercial: HNO3 70%, HCl >25%], dissolves gold so "king of metals" to form AuCl4, most other acids cannot attack gold so aqua regia is called "the acid test" of gold, dissolves platinum to form H2PtCl6
Boric acid



Boric acid, H3BO3, boracic acid, orthoboric acid, trioxyboric (III) acid, colourless, odourless, white to transparent, triclinic crystals, m.p. about 160oC, if heated decomposes to anhydride B2O3, occurs near fumaroles, (sold in pure form as a powder as eye medicine, disinfectant, insecticide), E284. Use boric acid to prepare children's clothing flame retardant. Common names: Boric acid, "cockroach killer"
Butenedioic acid






1. Cis-isomer of butenedioic acid, Maleic acid, C4H4O4, HO2CCHCHCO2H, HCOOHC:CHCOOH, cis-butenedioic acid, toxilic acid. Maleic acid, maleinic acid, malanic acid, toxilic acid, Heated maleic acid forms maleic anhydride, C4H2O3, (2,5-furandione). Poly(styrene-co-maleic anhydride), maleic copolymer, (4:1 mole ratio of styrene: maleic anhydride )
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2. Trans-isomer of butenedioic acid, Fumaric acid, HOOCCH:CHCOOH, (in Krebs cycle), fumaric acid, (fumarates), fruity taste, Food acid E297, in Fumaria officinalis, mushrooms, lichens.
Calcium carbide







Calcium carbide, CaC2, calcium dicarbide, calcium acetylide, carbide, acetylenogen, ethnide dicarbide, Toxic by all routes Calcium carbide, called "carbide", acetylenogen, was used in carbide lamps in cave explorer lamps, formerly in bicycle headlamps and underground mines. Many fires and explosions resulted from these lamps and they are now rarely used. The main hazard with calcium carbide is the ignition of air / acetylene mixtures. A violent explosion may occur, depending on the proportions of air and acetylene. Acetylene, when undiluted with air, burns with a smoky flame. Before igniting acetylene, be sure that it is not mixed with air. Commercial calcium carbide usually contains sulfur and phosphorus compounds that react with water to form strongly smelling gaseous impurities that act as a convenient indicator for the presence of acetylene.
Calcium carbonate






Calcium carbonate, CaCO3, powder, almost insoluble in water unless dissolved CO2 present, calcite, chalk, limestone, Iceland spar, marble chips, marble whiting, whiting, chalk, calc spar, pearl, coral, egg shells, whitewash, calcimine, seashells, (in antacid medicines to suppress reflux), Vienna lime, E170 firming agent food additive, heated in a lime kiln to form lime CaO, powdered abalone or oyster shell used as folk medicine, (school chalk, but usually school chalk is calcium sulfate)
limestone "Plasticine", modelling clay, (said to contain calcium carbonate, stearic acid, petroleum jelly, whiting, ten pigments), formerly "Harbutt's plasticine". "Plastilina" is a similar product. Common names: chunks: marble, limestone, powder: precipitated chalk.
Calcium chloride
Calcium chloride, anhydrous, granular, CaCl2, white granules or lumps, very hygroscopic, m.p. 772oC, (drying agent, desiccant), E509, used to form calcium metal, sold as laundry booster, de-icing chemical, Harmful if ingested. Calcium chloride dihydrate, CaCl2.2H2O
Common names: Laundry aid, laundry salt, road salt, (de-icing agent but must be pure calcium chloride)
Calcium dihydrogen phosphate Calcium dihydrogenphosphate, Ca(H2PO4)2.H2O, calcium phosphate monobasic, calcium dihydrogenphosphate monohydrate, calcium dihydrogen phosphate (V), calcium tetrahydrogen di-orthophosphate, calcium dihydrogen phosphate, leavening agent in baking powders.
Calcium hydroxide
Calcium hydroxide, Ca(OH)2, 0.02 M, saturated solution, 1.5 g Ca(OH)2 per litre
Calcium hydroxide solution, limewater, 10 g in 1 L of water, shake, allow it to settle, then decant the clear liquid.
Common names: slaked lime, garden lime
Calcium hypochlorite











Calcium hypochlorite, Ca(OCl)2, bleaching powder, (technical grade: available chlorine, 65%), bleaching agent, chlorinated lime, chloride of lime, calcium oxychloride grey-white powder, irritating odour, exothermic when dissolved in water, may explode if not stored securely, (bleaching powder contains both calcium hypochlorite [calcium chlorate (I), chlorinated lime] and calcium hydroxide, water sanitizing, whitening agent, "solid chlorine" is 70% chlorine for swimming pools). Bleaching powder forms chlorine gas that is highly irritant to the lungs. If acid is added to bleaching powder, large amounts of chlorine are produced. The mixture becomes hot and may boil violently. Do not add concentrated ammonia to bleaching powder because nitrogen trichloride, NCl3, may form. This is a violently unstable liquid, liable to explode without apparent reason. Bleaching powder is a convenient source of chlorine gas for other experiments. Add dilute hydrochloric acid from a dropping funnel to a slurry of bleaching powder and water in a conical flask fitted with a rubber stopper and gas collection system. Keep a solution of sodium hydroxide nearby to stop the reaction. Adding sodium hydroxide solution to the mixture does not pose any problems. Dispose of the waste mixture by diluting it with water and washing it down the drain.
Calcium oxide


CaO, calcium oxide, lime, quicklime, lump lime, caustic lime, burnt lime, E529, thermoluminescent in oxy-hydrogen flame to cause "limelight" used in agriculture for excess soil acidity, sold in building supplies shops, Toxic if ingested or by skin contact
Calcium phosphate



Calcium phosphate, Ca3O8P2, Ca3(PO4)2, β-calcium phosphate tribasic, β-tricalcium phosphate, tert-calcium phosphate, tri-calcium (ortho)phosphate, calcium phosphate (V), white powder, insoluble, from apatite mineral Ca5(PO4)3(OH, F, Cl), and rock phosphate, from animal bones and teeth, (used for fertilizer, facilitates uptake of DNA into cells, "bone ash" for craft), E341 Calcium phosphates, (buffer, sequestrant), formerly "calcium orthophosphate".
Calcium sulfate






Calcium sulfate, CaSO4, gypsum, CaSO4.2H2O, powder, calcium sulfate dihydrate, calcium sulfate (VI), calcium hemihydrate, anhydrite mineral. It occurs as plaster of Paris, CaSO4.½H2O, potters' plaster, school chalk, blackboard chalk, selenite, craft modelling powder, E516. It can be shaped before setting. It occurs in evaporating lakes. It is used as a stain remover and has anti-inflammatory action in the human body. Common names: Plaster of Paris CaSO4.H2O. (The term "alabaster" may refer to gypsum, or calcite, called "onyx-marble".) Mixture of gypsum and bentonite provides low electrical resistance around anodes and earthing rods.
Chromium (VI) oxide




Chromium (VI) oxide, chromium trioxide, CrO3, (chromic acid anhydride), Toxic, dark red powder, Formerly, a glass cleaning solution "chromic acid" was prepared by mixing a metal chromate or dichromate with concentrated acid in a chromate salt solution. However, this solution is dangerous and other glass cleaning detergent solutions should be used. Chromium (VI) oxide, forms explosive mixtures with combustibles or organic compounds. Chromic trioxide is a powerful oxidizing agent. Commercial: Chromic acid, polymer-supported. Do NOT use chromic acid for glass cleaning in school science laboratories.
Chromium (III) oxide Chromium (III) oxide, Cr2O3, chromium oxide, chromium trioxide, chromic oxide, chrome green, chromia, green chromium oxide for craft.
Citric acid








Citric acid, HOC(COOH)(CH2COOH)2, colourless to white crystalline powder readily soluble in water, odourless, translucent, orthorhombic crystals or granules, "2-hydroxy propane-1,2,3-tricarboxylic acid", m.p. about 100oC, slightly deliquescent in moist air, loses water of crystallization in dry air, (lemon juice), store in tight containers, very weak acid, with little corrosive action, sour taste of lemons, grapefruit, and other citrus fruits, also gooseberries and raspberries, caused by the citric acid in them, an ingredient in artificial lemonade powder. In health salts it acts with sodium bicarbonate in the mixture to produce the “fizz” when the mixture is added to water. Used for making up buffer solutions and forming citrate salts. Also "2-hydroxy-1,2,3-propanetricarboxylic acid", is about 10% dry weight of lemons. Lemon juice used as deodorizer, mild bleach, cleaner.
Cobalt (II) nitrate

Cobalt (II) nitrate hexahydrate, Co(NO3)2.6H2O, cobalt (II) nitrate hydrated, cobaltous nitrate, cobalt nitrate, (OXD 1477), Harmful if ingested, red, deliquescent, monoclinic crystals, m.p. 50o to 60oC, in dyes and inks.
Cobalt (II) oxide

Cobalt (II) oxide, CoO, cobalt oxide, cobaltous oxide, green orange to pink solid, craft blue glaze, do not inhale.
Copper (II) carbonate

Copper (II) carbonate basic, CuCO3.Cu(OH)2, cupric carbonate basic, basic copper carbonate, (azurite, malachite), cupric carbonate, green precipitate, Bremen blue, green verditer, craft green glaze, verdigris on copper exposed to atmosphere.
Copper (II) chloride Copper (II) chloride, CuCl2, cupric chloride, brown-yellow powder, covalent, green fireworks, copper (II) chloride dihydrate CuCl2.2H2O.
Copper (I) oxide Copper (I) oxide, Cu2O, cuprous oxide, red copper oxide, ruby copper, cuprite, for craft, red solid, insoluble, (used to make red glass).
Copper (II) sulfate












Copper (II) sulfate pentahydrate, CuSO4.5H2O, blue vitriol, cupric sulfate pentahydrate, copper (II) sulfate hydrated, copper (II) sulfate(VI)-5-water, blue, triclinic crystals, efflorescent in dry air, hold on to water of crystallization in hot dry air but anhydrous at 250oC, bluestone, blue vitriol, blue vitriol, bluestone, blue copperas, (chalcanthite mineral, CuSO4.5H2O has sweet metallic taste and is slightly poisonous), (Bordeaux mixture is copper sulfate and lime used as a fungicide), wood preservative, "Root Eater", "Bluestone" algicide, Harmful / Slightly toxic. It dissolves easily in water to form an acid solution. The crystals contain water of crystallization, which forms as steam when the crystals are heated. Poisonous if ingested, (swallowed), by skin contact, in contact with wounded skin. Use eye and skin protection, (safety glasses and gloves), where splashes may occur. Do not breathe in the powder. If swallowed or skin contact occurs immediately flush the eye or skin or wash out the mouth with plenty of water. Some school systems do not allow primary children access to copper (II) sulfate solution. However, show children the beautiful blue crystals. Harmful to organisms in the environment but dispose small amounts down the sink with plenty of water. The white anhydrous copper sulfate is used to test chemically for water. Copper sulfate is poisonous and should not be put into vessels used in the household. Common names: Blue vitriol, cupric sulfate, "Rooto Root Kill".
Copper (II) ferrocyanide


CU2Fe(CN)6, Hatchett's Brown dye, Traube's colloidal solution, (used to remove caesium and strontium from radioactive waste), red-brown copper (II) ferrocyanide
Potassium ferrocyanide precipitates red-brown copper (II) ferrocyanide from Cu2+ solutions:
2Cu2+ (aq) + [Fe(CN)6]4- (aq) <==> CU2Fe(CN)6 (s)
Devarda's alloy

Devarda’s alloy, AlCuZn, powder, 50% Cu, 45% Al, 5% Zn, tests for NO3-, reaction with NaOH strongly exothermic.
1,6-Diaminohexane

1,6-Diaminohexane, NH2(CH2)6NH2, hexamethylenediamine, (1,6-hexanediamine), HMDA, hexamine, methenamine, urotropine, ethylenediamine, store in refrigerator, strongly alkaline, (use < 25 mL), used to make nylon polymer, hexamine fuel tablets, (heat tablets, Esbit), preservative food additive E239, (not approved, USA, Australia), Flammable, irritant.
1,4-Dichlorobenzene


1,4-Dichlorobenzene, C6H4Cl2, m.p. 53oC, crystalline, p-dichlorobenzene, p-DCB, para-dichlorobenzene, 1,4-dichlorobenzol, "dichlorobenzene", colourless, strong odour, deodorant, (solid blocks deodorant in male toilets), pesticide, replacement for naphthalene mothballs, (Substitute hexadecan-1-ol or octadecan-1-ol for melting point curve experiments.), (Use ethanol to prepare dilute solutions).
Dichloromethane

Dichloromethane, anhydrous, CH2Cl2, methylene chloride, methylene dichloride, Freon 30, colourless liquid, b.p. 41oC, (refrigerant, degreasing, cleaning fluid, paint remover, solvent), ozone-depleting chemical so use very small amounts, (Use ethanol as solvent for dilute solutions).
Disodium hydrogen phosphate


Disodium hydrogen phosphate, Na2HPO4, sodium phosphate dibasic, disodium phosphate, sodium hydrogen phosphate, disodium hydrogen orthophosphate (V), sodium phosphate dodecahydrate, white monoclinic or rhombic crystals or granules, r.d. 1.5, m.p. 34oC to 35oC, easily loses H2O, E339 (II), anticaking agent, retards boiler scale.
EDTA


Ethylenediaminetetraacetic acid, (HOOCCH2)2N(CH2)2N(CH2COOH)2, edathamil, sequestering agent for metal ions, Mg2+, Ca2+. Complexing agent for most metal ions, especially Ca2+ and Mg2+. Water softening and remove scale from kettles, medical removal of excess metallic ions.
EDTA disodium salt

Ethylenediaminetetraacetic acid disodium salt dihydrate, C10H14N2Na2O8.2H2O, EDTA disodium salt, ethylenediaminetetraacetate dihydrate, (HOOCCH2)2N(CH2)2N(CH2COONa)2.2H2O, (0.1 M, solution + sodium azide), for electrophoresis, molecular biology.
Formaldehyde solution











Formaldehyde solution, ACS reagent, 37 wt. % in H2O, contains 10-15% Methanol as stabilizer (to prevent polymerization) HCHO, CH2O (aq), gas readily soluble in water, methanal, (+10% methanol), formalin: 40% methanal solution, (disinfectant, plastics), Do not mix with HCl because carcinogenic bis(chloromethyl) ether may form, so do not dispose formaldehyde and HCl in the same sink. Formaldehyde, (methanal), is highly poisonous and probably carcinogenic and should be handled with extreme care. Formaldehyde is transported and stored as a concentrated aqueous solution called formalin. When a bottle of formaldehyde is opened, a large amount of gas may be released. Do not inhale the formaldehyde gas. Do experiments with concentrated formaldehyde solutions in a fume cupboard. However, dilute formaldehyde solutions produce little formaldehyde and can be safely handled in the open laboratory. Preserve biological specimens in a solution of 50% ethanol and 50% water, instead of formaldehyde solution. Do not mix hydrochloric acid and formaldehyde solution because highly carcinogenic bis(chloromethyl) ether may form. Do not store bottles of hydrochloric acid near formaldehyde because the reaction might occur in the air. Do not dispose of formaldehyde solutions and hydrochloric acid in the same sink system.
Formic acid





Formic acid, HCOOH, methanoic acid, conc. 46 M, hydrogen carboxylic acid, in ants and stinging nettles, most simple carboxylic acid. Formic acid is highly poisonous and should be treated with care. It is highly volatile and the vapour should not be inhaled. Formic acid is the only simple aliphatic carboxylic acid to possess reducing properties because of the presence of a (-CHO) component in the molecular structure. So formic acid is both an aldehyde and a carboxylic acid.
HCOOH + H2O <--> H3O+ + HCOO-, Ka = 1.8 × 10-4.
Fuchsine, fuchsin











Fuchsine, (fuchsin), C20H19N3.HCl, rosaniline hydrochloride, triphenylmethane dyestuff, magenta dye, dark green crystals in water form purple red solution, (the colour of flowers of Fuchsia, Onagraceae), disinfectant for skin infections, stain bacteria, (not "fuchsin"), basic fuchsine has variable contents including rosaniline and similar compounds, used in Schiff's reagent test for aldehydes, acid fuchsine is mixture of basic fuchsine + sulfonic groups to decolorize it.
Commercial
1. Basic Fuchsin, C19H17N3.HCl, dye, Basic Parafuchsin, Basic Red 9, Magenta ™ O, Parafuchsin hydrochloride, Paramagenta hydrochloride, Pararosaniline chloride, Pararosaniline hydrochloride
2. Basic Fuchsin, C20H20ClN3 for microscopy, indicator (pH 1.0-3.1), Basic Violet 14, Fuchsin basic, Magenta™, Rosaniline
2. Acid Fuchsin, C20H17N3Na2O9S3, for tissue staining, Acid Violet 19, Fuchsin S, Fuchsin acid, Rubine S
Glucose
Glucose, C6H12O6, "D-(+)-Glucose", dextrose, glucose syrup, grape sugar, dextrose monohydrate, d-glucose, blood sugar, glucose anhydrous, glucose, (for babies), "Glucodin". Glucose is called grape sugar because of its occurrence in grapes. In table syrup, black treacle, ripe apples and cheap sweetening material for confectionery and sweets, e.g. barley sugar. Glucose is only half as sweet as sucrose, sugar but is more easily digested. It is manufactured by boiling starch with dilute sulfuric acid. Glucose is a carbohydrate, the hydrogen and oxygen being in the same proportion as in water. Common names: Corn syrup
Glycerol






Glycerol, HOCH2CH(OH)CH2OH, CH2OH.CHOH.CH2OH, (1,2,3-Propanetriol), glycerin, glycerine, clear, viscous, colourless odourless syrupy fluid that readily absorbs moisture, propane-123-triol, propane-1, 2, 3-triol, glycerin jelly, b.p. 290oC and decomposes, r.d. 1.26, absorbs water from air, miscible, soluble in water and alcohol, sweet taste and no smell and has no action on litmus paper. Used in cosmetics, toothpaste, shampoo, loosens stains, medical uses, manufacture of explosives and shaving cream. It is by-product of the manufacture of soap. Discovered by K. W. Scheele, 1779, who heated olive oil with lithage.
Hydrogen peroxide
















H2O2, "peroxide", peroxide, (of hydrogen), bleach, antiseptic, wastewater treatment for BOD, (biological oxygen demand) Contact with the eyes can cause serious long-term damage. Corrosive solution can cause skin burns. Decomposition may cause oxygen pressure build-up. Tightly sealed bottles of hydrogen peroxide may explode due to a build up of pressure of oxygen gas. Forms potentially explosive compounds with ketones, (acetone), alcohols, (ethanol), esters, glycerine, (glycerol), aniline, triethylamine and sodium carbonate. Do not mix hydrogen peroxide with powdered Mg, Zn or Al. A 3% solution is unstable. It decomposes slowly in storage to yield water and oxygen. It can decompose rapidly in the presence of catalysts. It is difficult to transport because of regulations governing is transport by air, sea and land. It is sold as a colourless solution for disinfecting and for bleaching hair, silk, and wool. It readily parts with one of its two oxygen atoms and forms water. These oxygen atoms cause the disinfecting and bleaching actions. The strengths of the solutions usually sold are marked as “10 volume” and “20 volume” that refer to the volume of oxygen given by 1 cc of the liquid. Thus “20 volume” means that 1 cc of the solution yields 20 cc of oxygen. If possible buy a small bottle of “20 volume” solution. It is usually kept in dark glass bottles, because light hastens the decomposition into water and oxygen.
Commercial: Hydrogen peroxide solution, 30 % (w/w) in H2O, contains stabilizer. MSDS: Harmful if swallowed. Risk of serious damage to the eyes. Heating may cause an explosion. Contact with combustible material may cause fire. Harmful by inhalation and if swallowed. Causes severe burns. Hydrogen peroxide concentration 30% solution is not permitted in schools.
Iron (II) ammonium sulfate


Ammonium iron (II) sulfate hexahydrate, (NH4)2Fe(SO4)2.6H2O, ammonium ferrous sulfate hexahydrate, ammonium iron (II) sulfate, Mohr's salt, ferrous ammonium sulfate, ammonium iron (II) sulfate, ammonium ferrous sulfate, 0.1 M solutions used to test cations, iron (II) compounds can be oxidized by air, but acidified solutions are stable.
Iron (II) sulfate
Iron (II) sulfate heptahydrate, FeSO4.7H2O, ferrous sulfate heptahydrate, green vitriol, copperas, wood preservative, inks, Green crystals, dissolve in water to form neutral solution, crystals turn brown if exposed to air when oxygen of the air converts iron (II) sulfate into brown sulfate of iron, iron (III) sulfate, ferric sulfate. Keep crystals stored in a sealed container. The same change when a solution iron (II) sulfate is heated. Prepare a solution by shaking the powdered crystals with cold water. Green vitriol was used in industry to make ink.
Iron (III) chloride


Iron (III) chloride hexahydrate, FeCl3.6H2O, ferric chloride hexahydrate, (FeCl3, ferric chloride anhydrous), iron chloride, iron trichloride, flores martis, black-brown, catalyst, 20% solution used for printed circuit board etchant but use eye protection and gloves. iron (III) chloride hexahydrate, 0.1 M electrochemistry solution, harmless.
Iron (III) oxide




Iron (III) oxide, Fe2O3, ferric oxide, iron sesquioxide, ferric sesquioxide, rust, red iron oxide, red ferric oxide, ferric oxide red, red iron oxide, haematite, hematite, magnetite, brown red powder, yellow brown pigment, red ochre, burnt ore, burnt ochre, jewellers rouge polish, Venetian red, crocus powder, source of iron, mixed with red clay for liver function. [Iron (III) oxide hydrated, Fe(OH)O, ferric hydroxide oxide, catalyst]
Lead (II) ethanoate

Lead (II) acetate trihydrate, Pb(CH3COO)2.3H2O, lead (II) acetate, lead acetate, m.p. 75oC, sugar of lead, white to colourless, monoclinic crystals or granules, slowly efflorescent, absorbs CO2 from air and becomes insoluble, test paper for H2S. [Lead (II) acetate basic, anhydrous, ≥72% for sugar analysis]
Lead (II) nitrate



Lead (II) nitrate, Pb(NO3)2, lead dinitrate, lead nitrate, white to colourless, translucent cubic or monoclinic crystals, decomposes at 470oC, only common soluble lead compound, forms explosive mixture with combustible materials, e.g. S, P, metal powders, heated solid forms highly toxic nitrogen dioxide, test for anions: forms bright yellow precipitate of lead iodide with sodium or potassium iodide.
Lead (II) oxide Lead (II) oxide, PbO, yellow lead oxide, flux, lead monoxide, lead protoxide, massicott, yellow amorphous powder, fused and crystalline form called litharge used as pigment in glass and enamels.
Lead (II/IV) oxide






Lead (II, IV) oxide, Pb3O4, (2PbO.PbO2), minium, red lead oxide, trilead tetraoxide, red lead, triplumbic tetroxide, lead tetroxide, Toxic by all routes, cumulative poison. It reacts violently with Al and Mg powders and some organic materials. Do not heat on a charcoal block. Old paints may contain > 30% lead but nowadays may contain only < 1% lead, bright red or orange, pigment, forms insoluble iron (II) plumbate and iron (III) plumbate with iron and iron oxides so it is used in anti-corrosive lead paints, especially rustproof primer paints. However, lead tetroxide is soluble in dilute hydrochloric acid so it can dissolve in the hydrochloric acid in the stomach and act as a lead poison. It is not soluble in water so it can be used in lead glass. It is used to make lead cell accumulators, (car batteries, lead-acid batteries), and flux. Minium stone is used for craft and smelting.
Magnesium carbonate


Magnesium carbonate basic, MgCO3, (3MgCO3.Mg(OH)2.3H2O), magnesium hydroxide carbonate, magnesium carbonate basic, light powder, magnesite, (carbonate of magnesia for craft), [food additive E504, drying agent, (desiccant), and anti-caking agent in table salt], (a mild laxative and Antacid medicine), heat resistant products, (dolomite MgCO3.CaCO3)
Magnesium chloride

Magnesium chloride anhydrous, MgCl2, magnogene, magnesium dichloride, Magnesium chloride hexahydrate, MgCl2.6H2O, magnesium chloride crystals, (hygroscopic), E511, electrolysed to form magnesium metal, used in de-icers, ice melts, Common names: Lushui, (used to make tofu from soy milk.)
Magnesium hydroxide

Magnesium hydroxide, Mg(OH)2, Harmful, powder irritates eyes and skin, brucite, weak solubility so weak base, absorbs carbon dioxide from the air in presence of water, (hydrated form called milk of magnesia, a laxative and Antacid medicine), E528. (Magnesium hydroxide nanopowder, <100 nm particle size)
Magnesium nitrate

Magnesium nitrate hexahydrate, Mg(NO3)2.6H2O, magnesium nitrate hexahydrate, AAS Solution, oxidizing, (OXD 1474), explosive mixtures with organic compounds and combustible materials, For 0.1 M solution, 25.6 g in 1 L water, Toxic if ingested
Magnesium sulfate







Magnesium sulfate anhydrous, magnesium sulfate heptahydrate, MgSO4.7H2O, hydrated magnesium sulfate heptahydrate, Epsom salts, (natural spring of water at Epsom in Surrey, England with allegedly health giving properties), epsomite, kieserite, colourless to white, odourless, rhombic crystals or granules, the white needle-shaped crystals dissolve easily in water forming a neutral solution, loses water of crystallization to dry air and possibly microwaves and even sound waves to form green powder hexahydrate MgSO4.6H2O, anhydrous at 250oC, bitter salt, (laxative, health salts component, unshrinking woollen clothing, fireproofing, plant fertilizer to prevent yellow between leaf veins and curling of leaves, bath relaxant, crystal gardens experiments, test for Ba and Sn cations). In hot weather loses some water of crystallization, so bright crystalline appearance becomes frosted white. Common names: Epsom salts
Manganese (IV) oxide





Manganese (IV) oxide, MnO2, manganese dioxide, manganese black, manganese dioxide, "black oxide of manganese", in pyrolusite, black powder resembling carbon in appearance but it can be distinguished from carbon because it does not burn away when heated on a metal lid, forms a wine-coloured borax bead, (catalyst, oxidizing agent, depolarizer in dry cells, e.g. flashlight batteries). Use as catalyst for decomposition of hydrogen peroxide. Do NOT use for thermal decomposition of potassium chlorate. Hydrated manganese oxide in some medicines for schizophrenics and diabetics. Industrial use in the preparation of chlorine gas and as a catalyst in the preparation of oxygen. Common names: Pyrolusite, (in some dry cell batteries.)
Mercury (I) chloride

Mercury (I) chloride, Hg2Cl2, calomel, mercurous chloride horn quicksilver, white crystals, r.d. 7.15, sublimes at 400oC, (reference electrode in calomel electric cells, mercury electrode in potassium chloride solution + calomel), Calomel is found with cinnabar mineral. Former laxative.
Mercury (I) nitrate



Mercury (I) nitrate dihydrate, Hg2(NO3)2.2H2O, mercurous nitrate dihydrate, forms explosive mixtures with combustible materials and organic compounds. The pure chemical has low toxicity if ingested. Used in redox reactions and metal displacement reactions. Millon's reagent contains mercury (I) nitrate, mercurous nitrate, in nitrous acid. Mercury (I) nitrate was formerly used in the manufacture of felt hats, caused tremors in the workers and leading to the term "mad as a hatter", a character in "Alice in Wonderland" by Lewis Carroll.
Mercury (II) nitrate




Mercury (II) nitrate monohydrate, Hg(NO3)2.H2O, mercuric nitrate monohydrate. Highly toxic if ingested, cumulative poison, Highly toxic if ingested or absorbed through the skin, cumulative poison. Use eye and skin protection when splashes can occur. Forms explosive mixtures with combustible materials and organic compounds. Do not heat the solid because mercury vapour and nitrogen dioxide forms. Do not add ethanol to solutions of mercury (II) nitrate in nitric acid because highly explosive mercury fulminate forms. Do not use for redox reactions. Use < 5 mL of 0.1 M per activity.
Mercury (II) chloride


Mercury (II) chloride, HgCl2, mercuric chloride, mercury bichloride, mercury sublimate, corrosive sublimate, white crystalline solid, colourless, odourless, rhombic crystals or granules, r.d. 5.4, m.p. 277oC, solution is poisonous and very dangerous because the solution looks like water, should NOT be in the school laboratory, formerly used to treat syphilis
Mercury (II) oxide

Mercury (II) oxide, HgO, mercuric oxide, yellow to orange, dense, odourless powder, r.d. 11.14, decomposed by light, yellow oxide of mercury or red oxide of mercury, store in dark bottles, do not heat to form oxygen gas because highly toxic mercury vapour forms. Mixture with powdered sulfur is explosive.
Methanol




Methanol anhydrous, CH3OH, methyl alcohol, wood alcohol, clear liquid, distinct odour, volatile, flammable, poisonous, general laboratory solvent, chromatography solvent, alcohol lamp fuel, (but invisible flame!), in rust inhibitor fuel additives, methanol and illegal home-made alcoholic beverages may cause blindness. Use < 5 mL of 0.1 M per activity or use in a fume cupboard. Substitute ethanol or methylated spirits as alternative solvent.
2-methoxyethanol

2-Methoxyethanol anhydrous, CH3OCH2CH2OH, ethylene glycol monomethyl ether, methyl glycol, methyl cellosolve. Use in a fume cupboard or use <50 mL in a well-ventilated area. May cause long-term nerve damage. May be teratogenic.
Monosodium glutamate, MSG


L-Glutamic acid monosodium salt hydrate, powder, [C5H8NNaO4.xH2O], [HOOCCH(NH2),CH2CH2COONa], [(S)-2-Aminopentanedioic acid], Glu, MSG, monosodium glutamate, sodium hydrogen glutamate, white crystals, soluble in water, flavour enhancer especially for Chinese food but some people are allergic to it, formerly from seaweed Laminaria japonica.
Nessler's reagent






Nessler’s reagent, K2HgI4, for qualitative determination of ammonia and ammonium compounds, potassium tetraiodomercurate-potassium hydroxide, solution, not permitted in some school systems because it contains mercury, Nessler's solution, (Julius Nessler 1827-1905), is a solution of mercury (II) iodide in potassium iodide made alkaline with sodium hydroxide or potassium hydroxide. It may be in a caustic soda solution. Add reagent to the original solution. A brown colour or precipitate indicates the presence of ammonium ion. The test is very sensitive. A trace of ammonia give a yellow colour but larger amounts of ammonia give a brown colour or precipitate. The test solution must contain no NH4+ added during analysis.
Nitrobenzene
Nitrobenzene, C6H5NO2, mononitrobenzene, pale yellow, oily liquid, unpleasant almond odour, poisonous, r.d. 1.2, b.p. 211oC. Highly toxic by all routes of exposure, possibly carcinogenic. Avoid inhaling vapour and skin contact so use small quantities < 25 mL or g in a well-ventilated area. May be explosive when heated. A solution / mixture < 0.1% is not hazardous.
Oxalic acid



Oxalic acid dihydrate, HO2CCO2H.2H2O, Ethanedioic acid (COOH)2.2H2O, H2C2O4 + 2H2O, ethanedioic acid-2-water, acid of sugar, colourless, white, odourless, monoclinic crystals or granules, r.d. 1.62, m.p. 101oC - 102oC, sublimes easily above 100oC, decomposed by heat, (in rhubarb and many plants). Common names: Non-chlorine bleach powder, (cleanser used in bars).
Phosphorus pentoxide




Phosphorus pentoxide, P2O5, phosphoric anhydride, P4O10, phosphorus (V) oxide, white powder, hexagonal crystals, deliquescent, thermoluminescent. It reacts violently with water to form phosphoric acid, liberating a large amount of heat, reacts violently with iodides. With sodium and potassium metals ignition on contact. With formic acid forms highly toxic carbon monoxide gas. Used as a dehydrating agent. The crust on the surface of old samples is mostly phosphoric acid, but remove it before using the phosphorus pentoxide beneath.
Phosphoric acid





Phosphoric acid, H3PO4, orthophosphoric acid, phosphoric (V) acid, crystalline, as solution is colourless, odourless liquid, conc. 14.7.M, r.d. 1.71 to 1.75, miscible with water and ethanol, "Kill-rust", E33, weak acid, or white rhombic solid, 85% W /W, 90% W / W, toilet bowl cleaner, prepared commercially by heating calcium phosphate rock with sulfuric acid, prepare by red phosphorus with nitric acid.
Low cost: from hardware stores, rust remover, e.g. "Naval Jelly", "Kill rust", or for cleaning concrete, from brewing or wine making suppliers, from hydroponics suppliers.
Potassium bromide

Potassium bromide, KBr, colourless, white, cubic crystals or granules, r.d. 2.75, m.p. 730oC, (photography, formerly a sedative and supposed to be put in tea of soldiers to control sexual urges), used to prepare bromine water, For 0.1 M solution, 12 g in 1 L water
Potassium carbonate


Potassium carbonate, K2CO3 anhydrous, "potash", (pearl ash, commercial potassium carbonate), salt of tartar, white, odourless granules, anhydrous potassium carbonate, r.d. 2.29, m.p. 891oC, (anhydrous is hygroscopic, cakes in moist air), E501, strong alkaline solution, For 0.1 M solution, 13.8 g in water, (soap making, glass making, sourdough)
Potassium chlorate


Potassium chlorate, KClO3, potassium perchlorate, Berthollet's salt (Claude Berthollet 1748-1822), colourless, white, odourless, monoclinic crystals, r.d. 2.32, m.p. 368oC then decomposes, explodes in contact with sulfur compounds, (in explosives, fireworks and weed killers), Do not use potassium chlorate to prepare oxygen with manganese dioxide catalyst.
Potassium chloride


Potassium chloride, KCl, sylvite, (sylvine), mineral, muriate of potash fertilizer, white, odourless, cubic crystals or powder, slightly hygroscopic, diet salt substitute, E508, extracted from waters of Dead Sea, sold as "lite salt". Low cost: from supermarkets as "sodium free salt", from garden supply stores as potassium fertilizer.
Potassium chromate









Potassium chromate, K2CrO4, lemon yellow crystals, m.p. 975oC, alkaline aqueous solution. Potassium chromate, as with other chromium (VI) salts, may be carcinogenic so handle it with care. However, when used in dilute solution, near neutral pH, it is relatively safe. When mixed with acid, chromate ions, CrO42-, first form dichromate ions, Cr2O72-, then chromic acid, H2CrO4. Solutions containing chromic acid are powerfully oxidizing and highly corrosive. Do not use the cleaning mixture called “chromic acid”, prepared by dissolving a metal chromate or dichromate in concentrated sulfuric acid. This cleaning mixture is not permitted in schools because it is dangerously corrosive to skin and eyes and is probably no more effective as a cleaning agent than strong detergent solutions or a suitable solvent. The reactions of potassium chromate and dichromate with sulfur, carbon, magnesium, aluminium and phosphorus are dangerous and are not permitted in schools.
Potassium dichromate







Potassium dichromate, K2Cr2O7, potassium bichromate, red prussiate of potash, ferro prussiate, bichrome, orange to red, odourless, monoclinic crystals or granules, r.d. 2.69, m.p. 398oC, strong oxidizing agent, toxic and fire risk from oxidation, formerly used mixed with sulfuric acid to clean laboratory glassware but nowadays this procedure not permitted in schools. Oxidation reactions involve the reduction of solutions of chromate or dichromate ions that cause colour changes from yellow or orange to pale green or colourless solutions. The reactions with the formation of an insoluble metal chromate give brightly coloured precipitates. Do not attempt to isolate these precipitates because they are carcinogenic. Prepare these precipitates in the smallest quantities that allow them to be seen. Do not use potassium dichromate solution to colour water for demonstrations. Used in machines to breath test for alcohol.
Potassium ferricyanide




Potassium ferricyanide (III), K3Fe(CN)6.3H2O, ( powder K3Fe(CN)6), red prussiate, potassium hexacyanoferrate (III), potassium ferric cyanide, ruby red, monoclinic crystals, heat decomposes then melts, r.d. 1.89, case-hardening agent, forms good crystals, used in redox experiments, Prussian blue dye, chemical analysis uses characteristic colour reactions, heating with concentrated sulfuric acid forms carbon monoxide gas, (in dyeing, etching blueprint paper, fertilizer), Highly toxic, boiling with dilute acids forms cyanide gas, Highly toxic, with concentrated ammonia solution may explode.
Potassium ferrocyanide




Potassium ferrocyanide, K4Fe(CN)6.3H2O, Potassium hexacyanoferrate (II) trihydrate, yellow prussiate, potassium hexacyanoferrate (II)-3-water, coordination compound, yellow prussiate of soda, yellow prussiate of potash, prussiate of potassium, yellow monoclinic crystals or powder, r.d. 1.85, case hardening agent, used to detect Fe3+ ions, efflorescent, anhydrous at 100oC, Environmental danger, direct heating of the solid forms cyanogen gas, Highly toxic, heating with concentrated sulfuric acid forms carbon monoxide gas, Highly toxic, boiling with dilute acids forms cyanide gas, Highly toxic, Mixtures with nitrite salts are explosive.
Potassium hydrogen carbonate


Potassium bicarbonate, KHCO3, potassium hydrogen carbonate, (impure potassium bicarbonate "American saleratus"), colourless, odourless, white granules, r.d. 2.17, (used in buffers, baking powder, aerated waters, antacid medicines, carbon dioxide fire extinguishers, some detergents, laboratory reagent. It occurs as calcinite mineral.
Potassium hydrogen tartrate



Potassium L-tartrate monobasic, (KHC4H4O7), KO2CCH(OH)CH(OH)CO2H, HOOC(CHOH)2COOK L(+)-Tartaric acid monopotassium salt, potassium hydrogen L-tartrate, tartaric acid monopotassium salt, potassium bitartrate, potassium hydrogen tartrate, tartar, (beeswing), acid potassium tartrate, white crystalline acid salt, purified form of brown crystals argol, (used in baking powder, from deposits in wine vats, the "crust" in crusted port that has finally fermented in the bottle). Common names: Cream of tartar.
Potassium hydroxide













Potassium hydroxide, KOH, caustic potash, lye, potash, white pellets, KOH "sticks" or rods in water, lumps, flakes, sticks, very deliquescent, absorbs CO2 and SO2 from air better than sodium hydroxide because more soluble, used to prepare soft soap and alkaline storage cells, heat from dissolving in water, r.d. 2.044, m.p. 380oC, E525, potassium lye, damages eyes and body tissues. KOH, solid, flake, pellets, 1 M analytical reagent, caustic potash, Potassium hydroxide, as a solid or concentrated solution is extremely corrosive to the skin and eyes. Always wear safety glasses when handling potassium hydroxide, even with dilute concentrations. If potassium hydroxide enters the eye, rinse the eye instantly with water. Solutions of potassium hydroxide on the skin feel soapy because fats in the skin are broken down to form anions of fatty acids, e.g. stearate, palmitate and oleate that give the solution a slippery feel. When potassium hydroxide dissolves in water, a large amount of heat is released, sometimes causing the solution to boil violently if it has not been stirred. So, always stir solutions in that potassium hydroxide is dissolving to dissipate heat and to provide a uniform concentration throughout the solution. Potassium hydroxide solutions boil at a higher temperature than pure water. Hygroscopic so keep in sealed plastic container, More corrosive to eyes than acids.
Potassium iodate





Potassium iodate, KIO3, potassium iodate, white, monoclinic crystals or granules, slightly deliquescent, r.d. 3.89, m.p. 560oC, oxidizing agent, (ingredient of iodized "table salt", analytical reagent), store out of light, (potassium iodate is potassium salt of iodic acid). It may ignite combustibles or organic compounds and produce toxic fumes. Violent reaction with aluminium, magnesium, carbon, sulfur, phosphorus. Violent reaction with sodium bisulfite if water added. Forms toxic fumes with concentrated sulfuric acid.
Potassium iodide







Potassium iodide, KI, colourless solution, white crystals or granules, r.d. 3.12, m.p. 698oC, slightly deliquescent in moist air, bitter taste,
can be separated from potassium iodate by fractional crystallization, becomes yellow when iodine lost to air, (chemical analysis, photography, additive to prepare iodized "table salt" to iodine deficiency, e.g. goitre), (in tincture of iodine medicine, solvent for iodine to form the brown triiodide ion I3-, KI3 (aq), used as a test for starch). Detects presence of Pb2+ ions when yellow precipitate of lead iodide forms. If KI solutions become yellow from iodine formation add sodium hydrogen sulfite solution to make solution colourless again.
Potassium permanganate























Potassium permanganate, KMnO4, potassium manganate (VII) (OXD 1490), Condy's crystals, Toxic if ingested, 0.2 M, 0.02 M, analytical reagent, purple red crystals, dark purple, bronze with metallic sheen, odourless, rhombic crystals, r.d. 2.7, heat decomposes, distinct sweet bitter taste, common strong oxidizing agent and disinfectant, chemistry analytical reagent, MnO4- ion. Potassium permanganate is a powerful oxidizing agent that forms dangerously combustible or even explosive mixtures with oxidizable materials or combustible materials: red phosphorus, cyanides, thiosulfates acetates, sugar, charcoal, sulfur, phosphorus, ammonium salts, active metal powders, organic compounds. The solid is also spontaneously flammable on contact with glycerine, ethylene glycol and other organic compounds. It forms violently explosive manganese heptoxide on mixing with concentrated sulfuric acid. Oxygen gas is formed on heating the solid, but toxic fine particles of manganese oxides are produced simultaneously; if the reaction occurs in a test tube, place a plug of glass wool in the end of the tube to trap particles. Do not use sulfuric acid for drying oxygen gas from decomposition of potassium permanganate, since the acid could accidentally mix with the salt and react explosively. For preparing oxygen gas, it is safer to use hydrogen peroxide and potassium permanganate, or hydrogen peroxide with manganese dioxide catalyst. If potassium permanganate is used for preparation of chlorine gas by reaction with hydrochloric acid, be sure that the solid is covered with a layer of water and that hydrochloric acid is used, NOT sulfuric acid. Acidified solutions are used as an oxidant in organic chemistry for the oxidation of aldehydes or alcohols. Neutral solutions are used to distinguish between alkanes and alkenes. Dilute aqueous solutions of potassium permanganate are relatively harmless and have been used medicinally for mouthwashes and bactericides. Potassium manganate (VII) is not a primary standard so make up an approximate concentration and titrate it against an ethanoic acid solution of known concentration. Potassium manganate (VII) crystals are so dark it is difficult to see if all have dissolved when making up a solution. Bottles of potassium manganate (VII) solution may have a brown precipitate around the top of manganese (IV) oxide formed when manganate (VII) ions react with water in the air. Used to stain wood and furniture. For water treatment, used for oxidation of Fe2+ --> Fe3+ , and Mn2+ --> Mn4+, remove tastes and odours, disinfectant, control nuisance organisms, control DBD, (dielectric barrier discharge), of ozone.
Potassium nitrate













Potassium nitrate, KNO3, "saltpetre", (US saltpeter), (occurs as nitre, niter, Bengali saltpetre), colourless, odourless, trigonal or rhombic crystals or white granules, r.d. 2.11, m.p. 333oC, Preservative E252, strong oxidizing agent that decomposes at 400oC to lose O2, (nitrate of potash fertilizer, fireworks, food preservative, explosives, e.g. gunpowder), E252. Potassium nitrate is a powerful oxidizing agent and forms explosive mixtures with most combustible materials. Potassium nitrate has relatively low toxicity, and can be safely used in aqueous solution. Do not mix potassium nitrate with charcoal, sulfur, red phosphorus or active metals, e.g. Na, powdered Al, Mg, cyanides, sulfides, thiosulfates, ammonium salts, acetates, household sugar or combustible material because these mixtures may be explosive. The demonstration of explosives is not permitted in schools. If testing production of oxygen from heated solid and lighted splint is accidentally dropped into molten salt, explosion may occur. Gunpowder, (black powder, black gunpowder), a mixture of potassium nitrate, charcoal and sulfur, the explosive propellant formerly used in firearms now superseded for modern firearms by smokeless powder, a mixture of potassium salts. Common names: Saltpetre, saltpeter, (used as stump remover, agricultural fertilizer, meat preserver.)
Potassium nitrite


Potassium nitrite, KNO2, white to yellow deliquescent solid, m.p. 440oC, explodes above 600oC, used to detect presence of amino groups inorganic compounds, reacts with acids to form toxic nitrogen dioxide gas that reacts with oxygen in the air to form highly toxic nitrogen dioxide gas.
Potassium sodium tartrate-4-water

Potassium sodium tartrate tetrahydrate, (KNaC4H4O6.4H2O), KOCOCH(OH)CH(OH)COONa,
L(+)-Tartaric acid potassium sodium salt, Rochelle salt, Seignette salt, Seidlitz powder, double salt sodium potassium tartrate, potassium sodium tartrate, potassium sodium 2, 3-dihydroxybutanedioate, saline cooling taste, piezoelectric.
Potassium sulfate


Potassium sulfate, K2SO4, sulfate of potash fertilizer, E515, white crystalline powder, prepared with potassium carbonate or potassium hydroxide with sulfuric acid, fertilizer as source of potassium iron instead of KCl for chlorine-sensitive plants.
Schiff's reagent

Schiff’s reagent, mixture of fuchsine and sodium bisulfite or sulfurous acid to decolorize it that forms red-violet, (magenta purple), colour in unknown solution as test for aldehydes, called "Schiff's test".
Silica




Silica, SiO2, fumed, silicic anhydride, silicon dioxide amorphous, silicon (IV) oxide, silicon oxide, silicon dioxide, E551, quartz sand, Silica gel drying agent, (desiccant), is hygroscopic amorphous hydrated silica. It may have added CoCl2, as a self-indicating moisture test, e.g. "Tell-Tale" Bags of silica gel drying agent are usually included in the packaging of food and goods that must be kept dry. The bags usually have the warning: "DO NOT EAT"! Silica powder is used a non-reactive bulking material in medical tablets.
Silver chloride
Silver chloride, (99.999%), AgCl, silver (I) chloride, white solid, cerargyrite, horn silver, kerargyrite, occurs in silver veins, dissolves in ammonia solution, (photography emulsions, pottery glaze), expensive!
Silver nitrate






Silver nitrate, AgNO3, nitric acid silver (I) salt, large, odourless, transparent, rhombic crystals or small white crystals, lunar caustic sticks for cauterizing, r.d. 4.35, m.p. 212oC, water soluble, becomes dark with organic matter, test for halogens, store in dark-coloured dropping bottle in a cool dark place. Use Tollens' reagent to demonstrate the reduction of silver nitrate solution by formic acid to form a mirror on the inside of the test-tube. It forms explosive mixtures with combustibles, e.g. sulfur, phosphorus, ethanol, metal powders. Used in redox reactions, metal displacement reactions, testing for chloride ions, preparation of Tollens' reagent.
Soda lime








Soda lime, CaO/NaOH, ACS reagent, granular, +100 mesh particle size
Soda lime, CaO/NaOH, with indicator, pellets
Soda lime, activated, soda lime non-indicating, soda lime self-indicating, (4-14 mesh sizes)
"NaOH + CaO", mixture of sodium hydroxide and calcium hydroxide prepared by dissolving calcium oxide with sodium hydroxide solution, then drying the products. Its reaction is milder than NaOH, so is used to avoid violent reactions. Also CaO used with NaOH keeps it dry because NaOH is hygroscopic. Tests for CO2, (if off-white: active, if violet: exhausted), For anaesthetics, the pH indicator ethyl violet is added to tell whether the soda lime can still absorb carbon dioxide. The critical pH is 10.3. It turns from colourless to violet.
Sodium benzoate


Sodium benzoate, C6H5COONa, benzoic acid sodium salt, sodium benzenecarboxylate, food preservative against yeast and bacteria but may cause cirrhosis, damage DNA and increase ageing, effective pH 2.5 to 4.2, dyes, antiseptic.
Sodium carbonate









Sodium carbonate, Na2CO3, calcined soda, carbonic acid disodium salt, soda ash, (Na2CO3.10H2O sodium carbonate decahydrate), sodium carbonate crystals, [formerly "nitre", (US niter)], soda crystals, sal soda, crystal carbonate, black ash, trona, E500 white, colourless or white crystals, odourless powder, hygroscopic, readily soluble in water to form strong alkaline solution, not decomposed by heat, (also anhydrous sodium carbonate, soda ash anhydrous, Na2CO3, soda ash is commercial sodium carbonate), r.d. 2.53, m.p. 851oC, used in glass production, softens "hard" water, used to removes grease, constituent of washing powders and bath salts, over half the weight of the crystals is water because of the water of crystallization. If solution left on the skin it may produce blisters. Allows sodium ions to displace calcium ions in clay particles so that clay particles in mud can be dispersed and held in suspension in the washing water. Common name: Washing soda, dissolves grease, disinfectant, softens water, cleans stains, absorbs odours, used to prepare dishwashing soap.
Sodium chlorate




Sodium chlorate, NaClO3, white solid, crystalline, bleach, weed killer, Oxidizing, (OXD 1495), Forms violently explosive mixtures with combustibles, organic compounds, ammonium compounds, sulfur, sulfides and finely divided metals that may detonate from friction, contact with strong acids by ignition. Sodium chlorate with concentrated sulfuric acid forms chlorine dioxide gas, unstable. Wood soaked in sodium chlorate become explosive.
Sodium chloride







Sodium chloride, NaCl, white, cubic crystals, (colourless if large), or granules, r.d. 2.17, m.p. 804oC, common salt, table salt, sodium chloride technical grade, rock salt, halite mineral, sea salt, brine, salt, white cubic crystals, not hygroscopic if pure, for chemistry experiments use "uniodized" table salt, dissolves readily in water to form a neutral solution often called brine. Used for cooking and flavouring and food preservative, making butter, curing fish, manufacturing chemicals, e.g. like washing soda. chlorinating swimming pools, animal licks, wine spills, carpet cleaning. Essential in diet and supplement needed after excessive dehydration and sweating, but high intake cause of high blood pressure, stroke, heart disease. Common names: "Canning or pickling salt" has no iodine added unlike table salt.
Sodium citrate


Sodium citrate dihydrate, Na3C6H5O7.2H2O, [HOC(COONa)(CH2COONa)2.2H2O], citric acid trisodium salt dihydrate, sodium citrate tribasic dihydrate, trisodium citrate dihydrate, crystalline trisodium citrate, trisodium-2-hydroxypropane-1, 2, 3-tricarboxy, (food buffer), E331.
Sodium dihydrogen phosphate


Sodium phosphate monobasic, powder, NaH2PO4, monosodium dihydrogen orthophosphate, monosodium phosphate, sodium dihydrogen phosphate, sodium dihydrogen orthophosphate, monosodium orthophosphate, Sodium phosphate monobasic dihydrate, sodium dihydrogen phosphate dihydrate, NaH2PO4.2H2O, white, odourless, rhombic crystals, insoluble in alcohol, slightly deliquescent, anhydrous at 100oC, in baking powder, food additive, buffers, E339. Also, sodium phosphate monobasic monohydrate NaH2PO4.H2O
Sodium hydrogen carbonate














Sodium bicarbonate, NaHCO3, sodium hydrogen carbonate, baking soda, bicarbonate of soda, bicarb, bi-carb soda, soda, carb soda, soda lye, (saleratus, "aerated salt", "Dwight's saleratus"), crystalline, white, odourless monoclinic crystals or granules, alkaline salt, r.d. 2.16 - 2.22. Occurs naturally in soda lakes, soda beds. Decomposes to lose CO2, forms sodium carbonate above 50oC. It may be marketed "aluminium free". About, 2 g of baking soda is neutralized by 24 mL, (1 cup), of milk. It is in antacids, baking powders, cream of tartar mixes, sourdough, bath salts, burn treatment, cow and cattle feed, degreasers, denture cleaning, deodorizers, effervescing health salts, e.g. Alka Seltzer, fire extinguishers, general cleaners, general neutralizers, kitchen and bathroom cleaners, paint stripping, self-raising flour, soils contaminated with PCBs, toothpaste. Sodium bicarbonate is a soft white powder that dissolves to a small extent in cold water. It is decomposed by hot water to form a very weak alkali. It turns red litmus blue, but is too weak an alkali to affect phenolphthalein. It is used in cooking as a leavening agent to form bubbles of carbon dioxide to expand bread dough, cake mix and pastry dough, to make them light and pleasant to eat. Use to clean barbecues, children's plastic toys, microwave ovens, and vacuum flasks, to deodorize carpets, refrigerators and shoes, to freshen dishcloths and laundry towels, to remove fruit juice stains and perspiration from clothing and to dissolve grease, to soften woollen socks, to add to bath water for relaxing feet soak, to precipitate toxic heavy metal ions and neutralize acid wastes before disposal, neutralize acid spills and to extinguish fires.
Sodium hydrogen sulfate







Sodium hydrogen sulfate, NaHSO4, sodium bisulfate, sodium bisulfate monohydrate, NaHSO4.H2O, sodium hydrogen sulfate monohydrate, deliquescent, anhydrous, nitre cake, sodium bisulfate, swimming pool acid, (COR 1821), white crystals, very soluble in water to form acid solution, deliquescent crystals when exposed to air to eventually form a solution so keep crystals in stoppered container, can be a substitute for dilute sulfuric acid in some experiments, preparation requires use of concentrated sulfuric acid so use crushed solid sodium hydrogen sulfate, the solid and the solution are corrosive so handle with care and avoid spills. If a spill occurs, wipe up spilled material immediately with a wet cloth and neutralize any remaining acid with dilute ammonia or baking soda until no longer an acid reaction with blue litmus paper.
Sodium hydrogen sulfate, fused, Na2S2O7.NaHSO4
Sodium hydrogen sulfite



Sodium bisulfite, NaHSO3, sodium hydrogen sulfite, deliquescent, white solid but dissolves in water to form yellow solution, with heat decomposed to form sodium sulfate, sulfur dioxide and sulfur so is used to sterilize wine casks and other containers in brewing industry. If KI solutions become yellow from iodine formation, add sodium hydrogen sulfite solution to make solution colourless again.
Sodium bisulfite ACS reagent may be a mixture of NaHSO3 and Na2S2O5.
Sodium hydroxide










Sodium hydroxide, NaOH, ACS reagent, pellets, solid, white rods, pearl, flakes, lumps, granules, very hygroscopic and absorbs CO2 from air, r.d. 2.13, m.p. about 318oC, caustic soda, soda, soda lye, white caustic, caustic drain cleaner 5%, in  "Drano", E524, (emulsifier), 1.22 gm cm-3, cakes if stored for long period, a caustic alkali, pH solution >10, soap making, rayon and paper industry, (used in experiments for reaction of oxides of Period 3 elements and an analytical reagent, preparing soap and making paper, cleaning cookers and removing old paint, dissolves grease in drains), very dangerous to eyes, release heat when dissolved in water, must be pure white colour to be pure sodium hydroxide, store in a bottle with a tightly fitting cork or rubber stopper, not glass stoppers or metal screw caps that tend to become cemented to the glass, solid or solution must not be handled because it destroys skin and causes painful blisters, also corrodes clothing. Treat accidental splashes with plenty of water, then neutralize with vinegar, citric acid or tartaric acid. Test the part affected with red litmus paper until it fails to turn blue. Always use in dilute solution.
Common names: Caustic soda, lye
Sodium hypochlorite














Sodium hypochlorite, NaOCl (aq), sodium chlorate (I), domestic bleach, bleaching fluid, e.g. "Chlorox" bleach, oxidizing agent, 12.5% solution, chlorox, liquid bleach, colourless, strong odour, heat decomposes, (4% Cl2), solution, (store below 25oC), (household bleach, domestic bleach, 5% NaOCl, bleaching fluid, disinfecting sinks and drains), chlorine water, chloride of soda, chlorine bleach, water treatment of swimming pools. NaOCl (aq) bleach evolves chlorine gas that is highly irritant to the lungs. If acid is added to bleach, large amounts of chlorine are produced. The mixture becomes hot and may boil violently. Do not add concentrated ammonia to bleach. Under some circumstances, nitrogen trichloride, (NCl3), forms. This is a violently unstable liquid, liable to explode without apparent reason. NaOCl can bleach materials like flower petals, leaves and human hair. NaOCl is a good source of chlorine gas for other experiments. Add dilute hydrochloric acid from a dropping funnel to bleach solution in a conical flask fitted with a rubber stopper and gas collection system. Keep sodium hydroxide solution nearby to stop the reaction. Sodium hypochlorite does not exist in solid form. A very weak solution may be sold as a gargle, e.g. Milton, but strong solutions are poisonous. Sodium hypochlorite with acids forms chlorine gas, toxic. Do not store near acids. Sodium hypochlorite, NaOCl, solution 5-16% chlorine bleach, 12.5% solution, Highly toxic by all routes, skin irritant, corrosive. Sodium hypochlorite decomposes in sunlight, store in dark cupboard, bottles in light build up pressure and may explode. Sodium hypochlorite solution, reagent grade, available chlorine 10-15% .
Sodium nitrate



Sodium nitrate, NaNO3, sodium nitrate (V), nitrate of soda, soda nitre, Chile saltpetre, nitratine, saltpetre, E251, (meat preservative, colour fixative), colourless, odourless, transparent, trigonal crystals or white granules, r.d. 2.26, m.p. 308oC, deliquescent in moist air, Chile saltpetre from caliche deposits, Chile nitre, (agricultural fertilizer), E251.
Sodium nitrite



Sodium nitrite, NaNO2, sodium nitrite (III) white to yellow rhombic crystals or granules, r.d. 2.17, m.p. 271oC, hygroscopic granules, (inhibits corrosion), E250. Sodium nitrite with acids forms nitrogen dioxide gas, toxic. Sodium nitrite with phenol, ammonium salts, thiosulfates, cyanides forms explosive explosive mixtures.
Sodium perborate

Sodium perborate monohydrate, BNaO3.H2O, powder, 20-100 mesh, strong oxidizing agent, for non-chlorine bleach detergents, monohydrate. Sodium perborate tetrahydrate, crystals, NaBO3.4H2O, (algaecide in swimming pools).
Sodium silicate



Sodium silicate solution, Na2O(SiO2)x.xH2O, sodium trisilicate solution, water glass, soluble glass glassy solid usually sold in strong solution as a thick syrupy liquid that dissolves in water to form an alkaline solution. Water glass solidifies on exposure to the air. Used as egg preservative, fireproofing fabrics, fresco base.
Sodium metasilicate, Na2SiO3, disodium metasilicate, disodium silicate, sodium silicate, sodium silicon oxide
Sodium sulfate





Sodium sulfate, anhydrous, granular, Na2SO4, (sodium sulfate decahydrate, crystalline, Na2SO4.10H2O) mirabilite mineral (rhombic crystals), hydrated, white efflorescent crystals that dissolve in water to form a neutral solution, Glauber's salt, sal mirabile, cake, former laxative, E514, in many mineral waters, (Sodium sulfate anhydrous Na2SO4, white hygroscopic powder, r.d. 2.67, m.p. 888oC), (glauberite mineral, Na2Ca(SO4)2, has a bitter and salty taste), (J. R. Glauber 1604-1668, Netherlands), prepared by sulphuric acid with common salt, loses water of crystallization in dry air.
Sodium sulfite
Sodium sulfite, anhydrous, Na2SO3, white hexagonal crystals or powder, r.d. 2.63, alkaline in water, (hydrated, sodium sulfate (IV)-7-water, Na2SO3.7H2O, E221)
Sodium thiosulfate-5-water





Sodium thiosulfate, Na2S2O3, sodium thiosulfate pentahydrate, Na2S2O3.5H2O, sodium thiosulfate-5-water, ("hypo", sodium hyposulfite), sodium thiosulfate pentahydrate, sodium thiosulfate hydrated, Harmful if ingested, colourless, odourless, monoclinic colourless crystals that dissolve in water to form a neutral solution or white granules, molar mass 158.11 g / mol, density 1.67 g / cc, m.p. 48.3oC, b.p. 100oC, soluble in water efflorescent in dry air, sodium hyposulfite is deliquescent in moist air. Used in photography for the process of “ fixing “, i.e. dissolving the silver bromide of the exposed plate or film. Loses water of crystallization at 490 K.
Tartaric acid








L-(+)-Tartaric acid, (2R,3R)-(+)-Tartaric acid, L-Threaric acid, C4H6O6, HO2CCH(OH)CH(OH)CO2H,
(CHOHCOOH)2, (CHOH)2(COOH)2, racemic acid, 2, 3-dihydroxybutanedioic acid, colourless, odourless, transparent, monoclinic crystals, or white granules, r.d. 1.76, m.p. 168 to 170oC E334, from potassium hydrogen tartrate, sour taste food flavour, in wine and fruits, e.g. tamarind, tartrate salts, from potassium tartrate, tartar. Tartaric acid is a white crystalline substance manufactured from grape juice. It is very weak acid is commonly used as an ingredient in effervescing health salts and its salt, potassium hydrogen tartrate, (cream of tartar), is used in baking powder. Tartaric acid has similar chemical actions to citric acid in that it liberates carbon dioxide gas from carbonates and bicarbonates, and it forms hydrogen when warmed with iron filings or zinc. It can clean copper coins by dissolving the surface copper (II) oxide.
Tin (II) chloride


Tin (II) chloride, anhydrous, powder, SnCl2, tin (II) chloride dihydrate, SnCl2.2H2O, stannous chloride dihydrate, stannous chloride, butter of tin, colourless, monoclinic crystals, absorbs O2 from air to form insoluble stannous oxychloride, r.d. 2.71, m.p. 37 to 38oC.
Titanium (IV) oxide Titanium (IV) oxide, powder, TiO2, titanium dioxide, colour white, opacifer, "white out" correction fluid, white pigments for tennis shoes, household white paint, from mineral rutile, ilmenite FeTiO3, food additive, E171, the three mineral forms are anatase, brookite and rutile
1,1,1-trichloroethane




1,1,1-​Trichloroethane, CH3CCl3, ACS reagent, (may contain 0.05% low alkyl epoxide as stabilizer), "Chlorothene", (E512), methyl chloroform, grease solvent, safer alternative to tetrachloromethane, (carbon tetrachloride, CCl4). Solvent in "white-out" correction fluids banned in many school systems because of "sniffing". Ozone-depleting chemical being phased out of use. Mixed with active metals, e.g. Na, Mg, Al, forms metal chloride and carbon in highly exothermic reaction. Substitute non-chlorinating solvents, e.g. acetone or ethanol.
Trichloromethane


Trichloromethane, CHCl3, chloroform, colourless, mobile, clear, sweet taste liquid, distinct odour, Not inflammable, vapour in flame may form poisonous gases, b.p. 61oC, store dark, cool place, former anaesthetic, solvent irritant, possibly carcinogenic, Do not store or use in school science laboratories.
Trisodium phosphate


Sodium phosphate, Na3PO4, sodium orthophosphate, trisodium phosphate, Sodium phosphate tribasic dodecahydrate, Na3PO4.12H2O, TSP, trisodium phosphate dodecahydrate, "sodium phosphate", tribasic, colourless to white odourless, trigonal crystals, r.d. 1.6, m.p. about 73oC, acidity regulator, food buffer, thickener E339.
Zinc oxide


Zinc oxide, ZnO, white to yellow, amorphous powder, r.d. 5.47, m.p. above 1 800oC, white pigment, zincite, white zinc, zinc white, Chinese white, spartalite, craft, zinc sun cream medicine and other skin problems.
Zinc sulfate


Zinc sulfate monohydrate, ZnSO4.H2O, zinc sulfate heptahydrate, ZnSO4.7H2O, colourless, odourless, white rhombic crystals or powder, r.d. 1.97, m.p. about 50oC, efflorescent in dry air, anhydrous at 200oC, decomposes above 500oC, white vitriol, zinc vitriol, white copperas, gosla rite, in zinc deficiency medicines