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Name Potassium hydroxide
CAS 1310-58-3
EINECS(EC#) 215-181-3
Molecular Formula HKO
MDL Number MFCD00003553
Molecular Weight 56.11
MOL File 1310-58-3.mol

Chemical Properties

Appearance White, deliquescent pieces, lumps, sticks, pellets, or flakes having a crystalline fracture. Keep well stoppered, absorbs water and carbon dioxide from the air. Soluble in water, alcohol, glycerol; slightly soluble in ether.
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
Fp  52 °F
storage temp.  0-6°C
solubility  H2O: 1 M at 20 °C, clear, colorless
form  powder
color  white
Specific Gravity 1.09
Odor Odorless
PH 14 (56g/l, H2O, 20℃)
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.
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).
LogP -1.380 (est)
Potassium Hydroxide is a water-soluble food additive and bleaching agent. upon exposure to air it readily absorbs carbon dioxide and moisture and deliquesces. it is used to destroy the bitter chemical constituents in olives that will be used as black olives.
CAS DataBase Reference 1310-58-3(CAS DataBase Reference)
NIST Chemistry Reference Potassium hydroxide(1310-58-3)
EPA Substance Registry System 1310-58-3(EPA Substance)

Safety Data

Hazard Codes  C,F,T,Xi
Risk Statements 
R34:Causes burns.
R35:Causes severe burns.
R22:Harmful if swallowed.
R11:Highly Flammable.
R39/23/24/25:Toxic: danger of very serious irreversible effects through inhalation, in contact with skin and if swallowed .
R23/24/25:Toxic by inhalation, in contact with skin and if swallowed .
R36/38:Irritating to eyes and skin .
R36/37:Irritating to eyes and respiratory system .
R67:Vapors may cause drowsiness and dizziness.
Safety Statements 
S7:Keep container tightly closed .
S16:Keep away from sources of ignition-No smoking .
S36/37:Wear suitable protective clothing and gloves .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) .
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection .
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
RIDADR  UN 2924 3/PG 2
WGK Germany  1
RTECS  TT2100000
Autoignition Temperature 425 °C (ethanol)
HazardClass  8
PackingGroup  II
HS Code  28152000
Safety Profile
Poison by ingestion. An eye irritant and severe human skin irritant. Very corrosive to the eyes, skin, and mucous membranes. Mutation data reported. Ingestion may cause violent pain in throat and epigastrium, hematemesis, collapse. Stricture of esophagus may result if substance is not immedately fatal. Above 84' it reacts with reducing sugars to form poisonous carbon monoxide gas. Violent, exothermic reaction with water. Potentially explosive reaction with bromoform + crown ethers, chlorine dioxide, nitrobenzene, nitromethane, nitrogen trichloride, peroxidized tetrahydrofuran, 2,4,6- trinitrotoluene. Reaction with ammonium hexachloroplatinate(2-) + heat forms a heat- sensitive explosive product. Violent reaction or ignition under the appropriate condtions with acids, alcohols, p-bis(l,3- dbromoethyl)benzene, cyclopentadene, germanium, hyponitrous acid, maleic anhydride, nitroalkanes, 2-nitrophenol, potassium peroxodisulfate, sugars, 2,2,3,3- tetrafluoropropanol, thorium dicarbide. When heated to decomposition it emits toxic fumes of K2O. See also SODIUM HYDROXIDE.
Hazardous Substances Data 1310-58-3(Hazardous Substances Data)
LD50 orally in rats: 1.23 g/kg (Smyth)

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