School Science Lessons.
Appendix A, Chemical compounds by chemical name.
Chemical names used in this document are usually the standard names
followed by synonyms. .
Please send comments to: J.Elfick@uq.edu.au.
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, (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
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, CH3CO2H, CH3COOH,
ethanoic acid, weak acid, Ka small, colourless, mobile liquid, r.d.
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, CH3COCH3, (CH3)2C=O,
dimethyl ketone, 2-propanone, clear colourless volatile liquid, characteristic
inflammable, r.d. 0.79 gm cm-3, b.p. 56.5oC,
miscible with water and ether and oils, sharp sweet taste, characteristic
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, 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
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 purchase from pottery supplies store.
Aluminium potassium sulfate.
Alum, potassium alum, "common alum", potash alum, hydrated potassium aluminium sulfate, hydrated aluminium potassium sulfate,
potassium sulfate 12-hydrate, kalinite, a double sulfate of aluminium, the "alum"
sold at grocery shops.
It is very astringent and is used for purifying
water. Al2(SO4)3.K2(SO4).24H2O or AlK(SO4)2.12H2O or KAl(SO4)2.12H2O.
The original "alum" was the hydrated double salt of aluminium and
potassium with colourless octahedral crystals and an astringent taste,
used for mordants before dyeing cloth. Later the term "alum" was used
to describe similar double sulfates where other elements,
or radicals replaced
aluminium or potassium.
So an "alum" is a hydrated aluminium potassium sulfate and related
Some plants with astringent roots are called alum
Aluminium ions form alums that are complex hydrated metal sulfates
that contain 12 or 24 H2O.
sulfate is a buffer and firming agent, E522.
Ammonium alum, AlNH4(SO4)2.12H2O.
Chrome alum, chromium (III) potassium sulfate, potassium chromium
sulfate, CrK(SO4)2.12H2O or K2SO4.Cr2(SO4)3.24H2O, for
tanning, mordant, photography. purple or violet-red octahedral crystals.
Aluminium sulfate octadecahydrate, Al2(SO4)3.18H2O,
wrongly "alum", E520, foam agent in fire extinguishers,
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, (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,
ammonium carbonate is double salt, ammonium hydrogen carbonate, (ammonium
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, 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, (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.
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.
(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
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, H3BO3, boracic acid, orthoboric
acid, trioxyboric (III) acid, colourless, odourless, white to transparent,
m.p. about 160oC, if heated decomposes
to anhydride B2O3, occurs near fumaroles,
in pure form as a powder as eye medicine, disinfectant, insecticide),
Use boric acid to prepare children's clothing flame retardant. Common names: Boric acid, "cockroach killer".
1. Cis-isomer of butenedioic acid, Maleic acid, C4H4O4,
HO2CCHCHCO2H, HCOOHC:CHCOOH, cis-butenedioic acid,
Maleic acid, maleinic acid, malanic acid, toxilic acid,
Heated maleic acid forms maleic anhydride, C4H2O3,
Poly(styrene-co-maleic anhydride), maleic copolymer,
(4:1 mole ratio of styrene: maleic anhydride ).
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, 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.
he 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, 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),
plasticine". "Plastilina" is a similar product. Common names: chunks:
marble, limestone, powder: precipitated chalk.
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,
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, 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, 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
calcium hydroxide, water sanitizing, whitening agent, "solid
chlorine" is 70% chlorine for swimming pools). Bleaching powder forms
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
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.
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, Ca3O8P2,
Ca3(PO4)2, β-calcium phosphate tribasic,
β-tricalcium phosphate, tert-calcium 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
sequestrant), formerly "calcium orthophosphate".
Calcium sulfate, CaSO4, gypsum, CaSO4.2H2O,
powder, calcium sulfate dihydrate, calcium sulfate (VI), calcium hemihydrate,
anhydrite mineral. It occurs as plaster of Paris, CaSO4.
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
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
Chromic trioxide is a powerful oxidizing agent. Commercial: Chromic
Do NOT use chromic acid for glass cleaning in school
Chromium (III) oxide.
Chromium (III) oxide, Cr2O3, chromium oxide,
chromium trioxide, chromic oxide,
chrome green, chromia, green chromium
oxide for craft.
Citric acid, HOC(COOH)(CH2COOH)2, colourless
to white crystalline powder readily soluble in water,
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
In health salts it acts with sodium bicarbonate in the
mixture to produce the fizz when the mixture is added to water.
for making up buffer solutions and forming citrate salts.
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),
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
bluestone, blue vitriol, blue vitriol, bluestone,
blue copperas, (chalcanthite mineral, CuSO4.5H2O
has sweet metallic taste and is
is copper sulfate and lime used as a fungicide), wood preservative, "Root
Eater", "Bluestone" algicide,
Harmful / Slightly toxic.
easily in water to form an acid solution.
The crystals contain water of
crystallization, which forms as steam when the crystals are heated.
if ingested, (swallowed), by skin contact, in contact with wounded skin.
Use eye and skin protection, (safety glasses and gloves), where splashes
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
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) <==>
Devardas alloy, AlCuZn, powder, 50% Cu, 45% Al, 5%
Zn, tests for NO3-,
reaction with NaOH strongly exothermic.
hexamethylenediamine, (1,6-hexanediamine), HMDA, hexamine,
urotropine, ethylenediamine, store in refrigerator, strongly alkaline,
(use < 25 mL),
used to make nylon polymer, hexamine fuel tablets, (heat
preservative food additive E239, (not approved, USA, Australia), Flammable, irritant.
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
(Substitute hexadecan-1-ol or octadecan-1-ol for
melting point curve experiments.),
(Use ethanol to prepare dilute solutions).
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.
Formaldehyde solution, ACS reagent, 37 wt. % in H2O,
contains 10-15% Methanol as stabilizer (to prevent polymerization)
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
is highly poisonous and probably carcinogenic and should be handled with
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
However, dilute formaldehyde solutions produce little formaldehyde
and can be safely handled in the open laboratory.
specimens in a solution of 50% ethanol and 50% water, instead of formaldehyde
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, HCOOH, methanoic acid, conc. 46 M, hydrogen carboxylic
acid, in ants and stinging nettles, most simple carboxylic acid.
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.
acid is both an aldehyde and a carboxylic acid.
HCOOH + H2O <--> H3O+ + HCOO-,
Ka = 1.8 × 10-4.
Fuchsine, (fuchsin), C20H19N3.HCl,
rosaniline hydrochloride, triphenylmethane dyestuff, magenta dye,
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
1. Basic Fuchsin, C19H17N3.HCl, dye,
Basic Parafuchsin, Basic Red 9, Magenta O,
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, RubineS.
"D-(+)-Glucose", dextrose, glucose syrup, grape sugar, dextrose monohydrate,
blood sugar, glucose anhydrous, glucose, (for babies), "Glucodin".
Glucose is called grape sugar because of its occurrence in grapes.
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
Glucose is a carbohydrate, the hydrogen and oxygen being in
the same proportion as in water.
Common names: Corn syrup.
Glycerol, HOCH2CH(OH)CH2OH, CH2OH.CHOH.CH2OH,
(1,2,3-Propanetriol), glycerin, glycerine, clear, viscous,
odourless syrupy fluid that readily absorbs moisture, propane-123-triol,
propane-1, 2, 3-triol, glycerin jelly, b.p. 290oC,
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.
H2O2, "peroxide", peroxide, (of hydrogen),
bleach, antiseptic, wastewater treatment for BOD, (biological oxygen demand)
Contact with the eyes can cause serious long-term damage.
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),
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.
So 20 volume means that 1 cc of the solution yields
20 cc of oxygen.
If possible buy a small bottle of 20 volume solution.
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,
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,
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,
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
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,
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,
470oC, the 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
Lead (II) oxide.
Lead (II) oxide, PbO, yellow lead oxide, flux, lead monoxide, lead
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
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
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
Minium stone is used for craft and smelting.
Magnesium carbonate basic, MgCO3, (3MgCO3.Mg(OH)2.3H2O),
magnesium hydroxide carbonate, magnesium carbonate basic, l
magnesite, (carbonate of magnesia for craft), [food additive E504, drying
and anti-caking agent in table salt], (a mild laxative
and Antacid medicine), heat resistant products, (dolomite MgCO3.CaCO3).
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, 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,
called milk of magnesia, a laxative and Antacid medicine), E528.
hydroxide nanopowder, <100 nm particle size).
Magnesium nitrate hexahydrate, Mg(NO3)2.6H2O,
magnesium nitrate hexahydrate, AAS Solution, oxidizing, (OXD 1474),
mixtures with organic compounds and combustible materials, For 0.1 M
solution, 25.6 g in 1 L water, Toxic if ingested.
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),
colourless to white, odourless, rhombic crystals
or granules, the white needle-shaped crystals dissolve easily in water
neutral solution, loses water of crystallization to dry air
and possibly microwaves and even sound waves to form green powder
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, exfoliates dry skin, relieves sore
joints, stops constipation, solution to reduce camellia bud drop, 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",
black powder resembling carbon in appearance.
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).
Used as catalyst for decomposition
of hydrogen peroxide.
Do NOT use for thermal decomposition of potassium
Hydrated manganese oxide in some medicines for schizophrenics
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),
is found with cinnabar mineral.
Formerly used as a laxative.
Mercury (I) nitrate.
Mercury (I) nitrate dihydrate, Hg2(NO3)2.2H2O,
mercurous nitrate dihydrate, forms explosive mixtures with combustible
and organic compounds. The pure chemical has low toxicity if ingested.
Used in redox reactions and metal displacement reactions.
contains mercury (I) nitrate, mercurous nitrate, in nitrous acid.
(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,
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.
Mercury (II) chloride should NOT be in the school laboratory.
It was 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,
heat to form oxygen gas because highly toxic mercury vapour forms.
Mixture with powdered sulfur is explosive.
Methanol anhydrous, CH3OH, methyl alcohol,
wood alcohol, clear liquid, distinct odour, volatile, flammable, poisonous,
laboratory solvent, chromatography solvent, alcohol lamp fuel,
(but invisible flame!), in rust inhibitor fuel additives, methanol and
home-made alcoholic beverages may cause blindness. Use < 5
mL of 0.1 M per activity or use in a fume cupboard. Substitute
methylated spirits as alternative solvent.
2-Methoxyethanol anhydrous, CH3OCH2CH2OH,
ethylene glycol monomethyl ether, methyl glycol, methyl cellosolve.
in a fume cupboard or use <50 mL in a well-ventilated area.
It may cause
long-term nerve damage and be teratogenic.
Monosodium glutamate, MSG.
L-Glutamic acid monosodium salt hydrate, powder, [C5H8NNaO4.xH2O],
acid], Glu, MSG, monosodium glutamate, sodium hydrogen glutamate, white
soluble in water, flavour enhancer especially for Chinese food,
but some people are allergic to it, formerly from seaweed Laminaria
Nesslers reagent, K2HgI4, for
qualitative determination of ammonia and ammonium compounds,
tetraiodomercurate-potassium hydroxide, solution,
Nessler's reagent is 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
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
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.
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.
explosive when heated.
A solution / mixture < 0.1% is NOT hazardous.
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
sublimes easily above 100oC, decomposed
by heat, (in rhubarb and many plants).
Common names: Non-chlorine bleach
powder, (cleanser used in bars).
Phosphorus pentoxide, P2O5,
phosphoric anhydride, P4O10, phosphorus (V) oxide,
hexagonal crystals, deliquescent, thermoluminescent.
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
Used as a dehydrating agent.
The crust on the surface of
old samples is mostly phosphoric acid,
but remove it before using the phosphorus
Phosphoric acid, H3PO4, orthophosphoric acid,
phosphoric (V) acid, crystalline, as solution is colourless, odourless
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
for cleaning concrete, from brewing or wine making suppliers,
from hydroponics suppliers.
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),
to prepare bromine water, For 0.1 M solution, 12 g in 1 L water.
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
For 0.1 M solution, 13.8 g in water, (soap making, glass making,
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
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, K2CrO4, lemon yellow
crystals, m.p. 975oC, alkaline aqueous solution.
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
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, 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
It was formerly used mixed with sulfuric acid to clean laboratory glassware
but nowadays this procedure NOT permitted in schools.
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
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 (III), K3Fe(CN)6.3H2O,
( powder K3Fe(CN)6), red prussiate, potassium hexacyanoferrate
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).
toxic, boiling with dilute acids forms cyanide gas,
Highly toxic, with
concentrated ammonia solution may explode.
Potassium ferrocyanide, K4Fe(CN)6.3H2O,
Potassium hexacyanoferrate (II) trihydrate, yellow prussiate,
hexacyanoferrate (II)-3-water, coordination compound, yellow prussiate
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,
direct heating of the solid forms cyanogen gas.
Highly toxic, heating
with concentrated sulfuric acid forms carbon monoxide gas,
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"),
white granules, r.d. 2.17, (used in buffers, baking powder, aerated waters,
carbon dioxide fire extinguishers, some detergents,
It occurs as calcinite mineral.
Potassium hydrogen tartrate.
Potassium L-tartrate monobasic, (KHC4H4O7),
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, 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,
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
e.g. stearate, palmitate and oleate that give the solution a slippery
When potassium hydroxide dissolves in water, a large amount of heat
It sometimes causing the solution to boil violently if it has NOT
so always stir solutions in that potassium hydroxide is dissolving
to dissipate heat and to provide a uniform concentration throughout
Potassium hydroxide solutions boil at a higher temperature than pure water.
Hygroscopic so keep in sealed plastic container.
It is more corrosive to eyes than
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
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, KI, colourless solution, white crystals or granules,
r.d. 3.12, m.p. 698oC, s
lightly deliquescent in moist air,
bitter taste, separatedfrom 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
Potassium permanganate, KMnO4, potassium manganate (VII)
(OXD 1490), Condy's crystals, Toxic if ingested, 0.2 M, 0.02 M,
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.
is a powerful oxidizing agent that forms dangerously combustible or even
explosive mixtures with oxidizable
materials, or combustible materials, e.g. 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
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,
because 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,
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.
solutions are used to distinguish between alkanes and alkenes.
solutions of potassium permanganate are relatively harmless and have been
used medicinally for mouthwashes and
(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+,
tastes and odours, disinfectant, control nuisance organisms, control DBD,
(dielectric barrier discharge), of ozone.
Used as topical fungicide and antiseptic.
Solution of 1 g per litre contols powdery mildew and black spot plant diseases.
However, pink staining causes problems.
Potassium nitrate, KNO3, "saltpetre", (US saltpeter),
(occurs as nitre, niter, Bengali saltpetre), colourless, odourless,
or rhombic crystals or white granules, r.d. 2.11, m.p. 333oC,
Preservative E252, strong oxidizing agent that decomposes at
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.
nitrate has relatively low toxicity, and can be safely used in aqueous
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,
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
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
Common names: Saltpetre, saltpeter, (used as stump
remover, agricultural fertilizer, meat preserver.).
Potassium nitrite, KNO2, white to yellow deliquescent
solid, m.p. 440oC, explodes above 600oC,
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),
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,
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.
Schiffs 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, SiO2, fumed, silicic anhydride, silicon dioxide
amorphous, silicon (IV) oxide, silicon oxide, silicon dioxide, E551,
Silica gel drying agent, (desiccant), is hygroscopic amorphous
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.
usually have the warning: "DO NOT EAT"!
Silica powder is used a non-reactive
bulking material in medical tablets.
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, 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,
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
e.g. sulfur, phosphorus, ethanol, metal powders.
in redox reactions, metal displacement reactions, testing for chloride
ions, preparation of Tollens' reagent.
Soda lime, CaO/NaOH, ACS reagent, granular, +100 mesh particle
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
Its reaction is milder than NaOH, so is used to avoid violent
lso CaO used with NaOH keeps it dry because NaOH is hygroscopic.
ests 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, C6H5COONa,
benzoic acid sodium salt, sodium benzenecarboxylate,
against yeast and bacteria but may cause cirrhosis, damage DNA and increase
effective pH 2.5 to 4.2, dyes, antiseptic.
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,
colourless or white crystals, odourless powder, hygroscopic,
readily soluble in water to form strong alkaline solution
Sodium carbonate is 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.
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 prepar
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
Sodium chloride, NaCl, white, cubic crystals, (colourless
if large), or granules, r.d. 2.17, m.p. 804oC,
table salt, sodium chloride technical grade, rock salt, halite mineral,
sea salt, brine, salt, white cubic crystals.
Sodium chloride is 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 dihydrate, Na3C6H5O7.2H2O,
trisodium salt dihydrate, sodium citrate tribasic dihydrate, trisodium citrate
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,
phosphate, sodium dihydrogen orthophosphate, monosodium orthophosphate,
sodium phosphate monobasic dihydrate, sodium dihydrogen phosphate dihydrate,
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,
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.
lose CO2, forms sodium carbonate above 50oC.
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.
Used 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
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
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,
requires use of concentrated sulfuric acid so use crushed solid sodium
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
so is used to sterilize wine casks and other containers in
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
Sodium hydroxide, NaOH, ACS reagent, pellets, solid, white rods,
pearl, flakes, lumps, granules, very hygroscopic and absorbs
from air, r.d. 2.13, m.p. about 318oC, caustic soda, soda, soda
lye, white caustic, caustic drain cleaner 5%, in "Drano", E524,
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),
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
to the glass, solid or solution must NOT be handled because it
destroys skin and causes painful blisters, also corrodes clothing.
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, 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,
solution, (store below 25oC), (household
bleach, domestic bleach, 5% NaOCl, bleaching fluid, disinfecting sinks
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
The mixture becomes hot and may boil violently.
Do NOT add
concentrated ammonia to bleach.
Under some circumstances, nitrogen trichloride,
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
Add dilute hydrochloric acid from a dropping funnel to
bleach solution in a conical flask fitted with a rubber stopper and gas
Keep sodium hydroxide solution nearby to stop the reaction.
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.
with acids forms chlorine gas, toxic.
Do NOT store near acids.
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, NaNO3, sodium nitrate (V), nitrate of
soda, soda nitre, Chile saltpetre, nitratine, saltpetre, E251,
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
Sodium nitrite, NaNO2, sodium nitrite (III) white to
yellow rhombic crystals or granules, r.d. 2.17, m.p. 271oC,
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 monohydrate, BNaO3.H2O,
powder, 20-100 mesh, strong oxidizing agent, for non-chlorine bleach
monohydrate. Sodium perborate tetrahydrate, crystals, NaBO3.4H2O,
(algaecide in swimming pools).
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
Water glass solidifies on exposure to the
Used as egg preservative, fireproofing fabrics, fresco base.
Sodium metasilicate, Na2SiO3, disodium metasilicate,
disodium silicate, sodium silicate, sodium silicon oxide.
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,
sulfate anhydrous Na2SO4, white hygroscopic powder,
r.d. 2.67, m.p. 888oC), (glauberite mineral, Na2Ca(SO4)2,
bitter and salty taste), (J. R. Glauber 1604-1668, Netherlands),
prepared by sulphuric acid with common salt, loses water of
in dry air.
Sodium sulfite, anhydrous, Na2SO3, white
hexagonal crystals or powder, r.d. 2.63,
alkaline in water, (hydrated,
sodium sulfate (IV)-7-water, Na2SO3.7H2O,
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
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.
L-(+)-Tartaric acid, (2R,3R)-(+)-Tartaric acid, L-Threaric acid,
(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
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
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
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
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
1,1,1-Trichloroethane, CH3CCl3, ACS reagent,
(may contain 0.05% low alkyl epoxide as stabilizer), "Chlorothene", (E512),
chloroform, grease solvent, safer alternative to tetrachloromethane,
(carbon tetrachloride, CCl4).
Solvent in "white-out" correction
fluids banned in many school systems because of "sniffing".
chemical being phased out of use.
Mixed with active metals, e.g. Na, Mg,
Al, forms metal chloride and carbon in highly exothermic reaction.
non-chlorinating solvents, e.g. acetone or ethanol.
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,
former anaesthetic, solvent irritant, possibly carcinogenic.
Do NOT store or use in school science laboratories.
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, 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
Zinc sulfate monohydrate, ZnSO4.H2O, zinc
sulfate heptahydrate, ZnSO4.7H2O,
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.