flinnsci.com CHEMICALS SAVE ON HAZMAT FEES 85
HAZARD ALERT: Slightly toxic by ingestion; body tissue irritant. LD50 1870
mg/kg.
Storage: Inorganic #4
Disposal: #26a
Shelf Life: Hygroscopic; store in a Flinn Chem-Saf ™ Bag.
Soluble: Water; not alcohol.
Color and Odor: White, odorless solid.
CAS No. 584-08-7
Potassium Carbonate
sesquihydrate
reagent grade, crystal
K2CO3•1.5H2O
F.W. 165.24
P0157 100 g $14.90
HAZARD ALERT: Body tissue irritant. LD50 1870 mg/kg.
Storage: Inorganic #4
Disposal: #26a
Shelf Life: Indefinite
Soluble: Water; not alcohol.
Color and Odor: White, odorless solid.
CAS No. 6381-79-9
Potassium Chlorate
laboratory grade, powder
KClO3
F.W. 122.56
P0040 500 g $17.00
P0041 2 kg 59.75
HAZARD ALERT: Strong oxidizer; slightly toxic; irritant. LD50 1870 mg/
kg. Extremely dangerous since the substance, if only slightly contaminated,
will explode when exposed to moderate shock or when heated. Because this
substance is so frequently a source of accidents on school premises we have
elected to list some of the incompatible substances that should be avoided:
Ammonium Salts Phosphorus Carbon
Sulfuric Acid Combustible Material Metal Powders
Finely Divided Materials Organic Materials Sulfur Sugar
SPECIAL HAZARD ALERT: Only pure manganese dioxide
(manganese(IV) oxide) should be used with potassium chlorate for oxygen
preparation. A safer method is the catalytic decomposition of hydrogen peroxide.
You will find this method recited in detail under the oxygen gas listing in
this Catalog/Reference Manual.
Storage: Inorganic #6
Disposal: #12a
Shelf Life: Indefinite if stored safely.
Soluble: Boiling water.
Color and Odor: White, odorless solid.
CAS No. 3811-04-9
Technical Note: Potassium Chlorate as an O2 Source: Molar volume is
frequently measured by generating O2 using potassium chlorate and manganese
dioxide. Molten KClO3 is a powerful oxidizer of organic materials like the
rubber in the stoppers used in the generating apparatus. Explosions can and do
result. Please call or email us to obtain a free copy of Publication No. 1001, which
describes a safe method involving the use of dry ice to measure molar volume.
Potassium Chloride
reagent grade, crystal
KCl
F.W. 74.56
P0183 100 g $ 6.25
P0042 500 g 11.25
P0043 2 kg 39.50
HAZARD ALERT: Slightly toxic by ingestion. LD50 2600 mg/kg.
Storage: Inorganic #2
Disposal: #26a
Shelf Life: Poor; hygroscopic.
Soluble: Water; slightly in alcohol.
Color and Odor: White, odorless solid.
CAS No. 7447-40-7
Potassium Chloride Solution
(as KCl)
0.5 Molar P0236 500 mL $7.45
0.1 Molar P0160 500 mL 7.26
Storage: Inorganic #2
Disposal: #26b
Shelf Life: Good
Color and Odor: Colorless, odorless liquid.
Potassium Chromate
reagent grade, crystal
K2CrO4
F.W. 194.21
P0044 100 g $14.10
P0045 500 g 33.35
HAZARD ALERT: Known carcinogen. Highly toxic; harmful to skin, eyes,
and respiratory tract; corrosive action on skin and mucous membranes.
Possible reproductive/fertility hazard. Chromates as a chemical family
deserve special safety attention from science teachers. LD50 (mouse)
180 mg/kg.
Storage: Inorganic #8 in a Flinn Chem-Saf ™ Bag inside a locked poisons
cabinet.
Disposal: #12a
Shelf Life: Indefinite
Soluble: Water; not alcohol.
Color and Odor: Yellow, odorless solid.
CAS No. 7789-00-6
Potassium Chromate Solution
(as K2CrO4)
1 Molar P0161 500 mL $14.35
HAZARD ALERT: Moderately toxic by ingestion; may be corrosive to body
tissue. Possible reproductive/fertility hazard.
Storage: Inorganic #8
Disposal: #12a
Shelf Life: Good
Color and Odor: Yellow, odorless liquid.
Potassium Dichromate
reagent grade, crystal
K2Cr2O7
F.W. 294.22
P0047 100 g $14.35
HAZARD ALERT: Known carcinogen. Strong oxidant; fire risk in contact
with organic material; toxic by ingestion and inhalation; corrosive to body
tissue. Possible reproductive/fertility hazard. LD50 190 mg/kg.
Storage: Inorganic #8 in a Flinn Chem-Saf ™ Bag inside a locked poisons
cabinet.
Disposal: #12a
Shelf Life: Indefinite
Soluble: Water; not alcohol.
Color and Odor: Orange, odorless solid.
CAS No. 7778-50-9
Potassium Dihydrogen Phosphate
see Potassium Phosphate, Monobasic
Potassium Ferricyanide
potassium hexacyanoferrate(III)
reagent grade, crystal
K3Fe(CN)6
F.W. 329.26
P0050 100 g $ 11.20
P0051 500 g 35.05
HAZARD ALERT: If heated or in contact with concentrated acids, poisonous
fumes of hydrogen cyanide gas may evolve. Compound itself has slight
toxicity. LD50 1600 mg/kg.
Storage: Inorganic #7
Disposal: #14. P-Listed (P030); purchase small amount for effective inventory
control.
Shelf Life: Fair, but light-sensitive. Store in a Flinn Chem-Saf ™ Bag.
Soluble: Water; slightly in alcohol.
Color and Odor: Orange, odorless solid.
CAS No. 13746-66-2
What Does LD50 Mean?
LD50 (lethal dose, 50% kill) is the dose that, when administered to test
animals, kills half of them. The LD50 is expressed in milligrams (mg) of
substance per kilogram (kg) of animal body mass and the method by which
the toxicant was administered (e.g., oral, intravenous).
Inhalation toxicity
data are reported as LC50, the lethal concentration, in ppm/hr. For more
information,
review the article on toxicity on pages 1190–1191.
Potassium Carbonate continued
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