Page 85 - Demo

“Your Safer Source for Science”
POLYVINYL ALCOHOL continued
Shelf Life: Indefinite
Soluble: Water
Color and Odor: Off-white, odorless solid.
CAS No. 9002-89-5
Technical Note: If you are buying polyvinyl alcohol to prepare a polymer (like the toy “slime”), also consider guar gum as a substi- tute. See separate catalog listing.
Polyvinyl Alcohol Solution
Storage: In a tightly capped bottle. This substance will act as a growth media and should be kept cool.
Disposal: #26b
Shelf Life: Poor unless kept cool and uncontaminated.
Color and Odor: Cloudy, odorless solid.
Technical Note: Mix with saturated sodium borate solution to prepare a polymer (“slime”).
Potash
see Potassium Carbonate
Potassium
 HAZARD ALERT: Extremely dangerous in contact with moisture and water; releases hydrogen with sufficient heat to cause ignition or explosion; may ignite spontaneously in air or oxygen; can cause severe skin or eye burns. Shipped under dry oil (no water) and that is the way it must be stored. Keep away from water and handle with dry utensils.
  SPECIAL HAZARD ALERT: Peroxide coatings are well known to develop on the exterior surface of potassium metal. The peroxide coating consists of potassium superoxide (KO2) and potassium peroxide (K2O2). Potassium superoxide is yellow and reacts explo- sively with the light oil in which the product is stored when the metal is cut into small pieces. Do not use any potassium that is old or yellow! If you have a choice as to which alkali metal you use, sodium metal is a better choice since, upon aging, it does not develop peroxides.
Storage: Inorganic #1 under dry oil in a Flinn Saf-Stor TM Can. Disposal: #3
Shelf Life: Poor; see Special Hazard Alert above.
Soluble: Do not attempt to place into solution.
Color and Odor: As new metal, silvery; as old metal, gray to white to off-white; odorless.
CAS No. 7440-09-7
Potassium Acetate
 HAZARD ALERT: Slightly toxic by ingestion. LD50 3250 mg/kg. Storage: Inorganic #2
Disposal: #26a
Shelf Life: Poor; substance deliquescent; store in a Flinn Chem- Saf TM Bag.
Soluble: Water and alcohol.
Color and Odor: White solid with slight vinegar odor. CAS No. 127-08-2
83
Save On HazMat Fees
Potassium Acid Phthalate
see Potassium Hydrogen Phthalate
Potassium Aluminum Sulfate
see Aluminum Potassium Sulfate
Potassium Bicarbonate
Storage: Inorganic #4
Disposal: #26a
Shelf Life: Poor; hygroscopic.
Soluble: Water; not alcohol.
Color and Odor: White, odorless solid. CAS No. 298-14-6
Potassium Binoxalate
 HAZARD ALERT: Moderately toxic by ingestion. Storage: Inorganic #2
Disposal: #18b
Shelf Life: Poor; hygroscopic.
Soluble: Water
Color and Odor: White, odorless solid. CAS No. 127-95-7
Potassium Biphthalate
see Potassium Hydrogen Phthalate
Potassium Bisulfate
 HAZARD ALERT: Slightly toxic by ingestion; severe body tissue irritant. LD50 2340 mg/kg.
Storage: Inorganic #2
Disposal: #26a
Shelf Life: Deliquescent; store in a Flinn Chem-Saf TM Bag. Soluble: Water; decomposes in alcohol.
Color and Odor: White solid with peanut brittle odor. CAS No. 7646-93-7
Potassium Bitartrate
Storage: Inorganic #2
Disposal: #26a
Shelf Life: Indefinite
Soluble: Boiling water; not alcohol. Color and Odor: White, odorless solid. CAS No. 868-14-4
potassium hydrogen carbonate reagent grade, crystal
KHCO3 F.W. 100.12
P0032
100 g
$ 9.05
P0033
500 g
16.65
4%, aqueous
P0209
500 mL
$ 9.65
P0210
1 liter
17.80
P0211
4 liters
52.90
potassium acid oxalate
laboratory grade, crystal or powder
KHC2O4•1⁄2H2O F.W. 136.12
P0232
100 g
$55.05
laboratory grade
K
A.W. 39.10
P0204
Bottle of 5
$23.35
small pieces for demonstration
(Packaged under mineral oil inside a plastic bottle.
The bottle is contained within a metal can for storage protection.)
potassium hydrogen sulfate reagent grade, crystal
KHSO4 F.W. 136.17
P0134
100 g
$15.05
P0034
500 g
29.45
potassium hydrogen tartrate laboratory grade, powder
KHC4H4O6 F.W. 188.18
P0135
100 g
$10.20
P0035
500 g
24.50
acetic acid, potassium salt reagent grade, crystal
KC2H3O2 F.W. 98.15
P0030
100 g
$11.95
P0031
500 g
23.60
What Does Moderately Toxic Mean?
Moderately toxic materials may be described as harmful if swallowed. They have Oral-Rat LD50 values between 300–2000 mg/kg or Inhalation-Rat LC50 of 220–2200 ppm/hr. To avoid chemical contact, immediately clean up all spills and never eat or drink in the lab. Rely on Flinn to help you understand chemical hazards and how they can affect you.