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Potassium hydroxide

Chemical Properties

Melting point 361 °C (lit.)
Boiling point 1320°C
Density  1.450 g/mL at 20 °C
vapor pressure  1 mm Hg ( 719 °C)
refractive index  n20/D 1.421
Flash point 52 °F
storage temp.  Store at +5°C to +30°C.
solubility  H2O: 1 M at 20 °C, clear, colorless
form  powder
Specific Gravity 1.09
color  white
Odor Odorless
PH 10.98(1 mM solution);11.95(10 mM solution);12.88(100 mM solution);
explosive limit 3.5-15.0%(V) (ethanol)
Water Solubility  soluble
Sensitive  Air Sensitive & Hygroscopic
Merck  14,7640
Exposure limits Ceiling in air 2 mg/m3 (ACGIH).
Stability Stable, but very hygroscopic. Dissolves exothermically in water. Incompatible with most metals, strong acids, acid chlorides, organic materials, zinc, aluminium, nitroalkanes, nitrobenzene, chlorine dioxide. Reacts vigorously with a wide variety of other materials. Readily absorbs water and carbon dioxide from the air.
CAS DataBase Reference 1310-58-3(CAS DataBase Reference)
NIST Chemistry Reference Potassium hydroxide(1310-58-3)
EPA Substance Registry System Potassium hydroxide (1310-58-3)

Safety Information

Hazard Codes  C,F,T,Xi
Risk Statements  34-35-22-11-39/23/24/25-23/24/25-36/38-36/37-67-52/53
Safety Statements  7-16-36/37-45-36/37/39-26-61
RIDADR  UN 2924 3/PG 2
WGK Germany  1
RTECS  TT2100000
Autoignition Temperature 425 °C (ethanol)
HazardClass  8
PackingGroup  II
HS Code  28259090
Hazardous Substances Data 1310-58-3(Hazardous Substances Data)
Toxicity LD50 orally in rats: 1.23 g/kg (Smyth)


Usage And Synthesis

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