Potassium hydroxide

Molecular formula: KOH

Molecular weight: 56.11

Alias: caustic potash, caustic soda

Potassium hydrate, Caustic potash, Potassa

Appearance: White granules, block or stick. Strong alkaline and corrosive. It is easy to absorb moisture in the air and deliquescence, and absorb carbon dioxide to form potassium carbonate. Soluble in about 0.6 parts hot water, 0.9 parts cold water, 3 parts ethanol, 2.5 parts glycerin. A lot of heat is generated when dissolved in water, alcohol or treated with acid. The pH of the 0.1 mol/L solution is 13.5. Moderately toxic, the median lethal dose (rat, oral) is 1230 mg/kg. Soluble in ethanol, slightly soluble in ether. It has strong alkalinity and corrosiveness, and its properties are similar to caustic soda.

Relative density: 2.044, melting point 380°C (anhydrous)

Quality standard: GB/T2306-80

Item ltem Excellent grade pure analytical pure chemical pure (GR) (AR) (CP)

Content (KOH) Assay,% ≥82 82 80

Clarity test Clarity Qualified Qualified Qualified

Carbonate (K2CO3) Carbonate,%≤ 1 2 3

Chloride (Cl)Chloride,%≤ 0.005 0.01 0.025

Sulfate (SO4)Sulfale,% ≤ 0.003 0.005 0.01

Nitrogen compound (N) Nitrogen,% ≤ 0.0005 0.0005 0.001

Phosphate (PO4) Phosphate,%≤ 0.002 0.005 0.01

Silicate (SiO3) Silicate,%≤ 0.01 0.02 0.1

Sodium (Na)Sodium,%≤ 1.0 2.0 2.0

Aluminum (Al)Aluminum,%≤ 0.002 0.005 --

Calcium (Ca)Calcium,% ≤ 0.003 0.01 0.02

Iron(Fe)Iron,%≤ 0.0005 0.001 0.002

Nickel (Ni) Nickel,%≤ 0.0001 0.0005 --

Heavy metals (calculated as Pb) Heavy metals,%≤0.002 0.002 0.003

ACS class

Project name ACS Grade

Content (KOH) Assay≥99.0%

Potassium Carbonate Content (K2CO3) Potassium Carbonate≤2.00%


Nitrogen compounds (calculated as N) Nitrogen compounds≤0.001%

Phosphate (PO4) Phosphate≤5ppm


Heavy metals (calculated as Pb) Heavy metals≤0.001%



Calcium (Ca)Calcium≤0.005%

Magnesium (Mg) Magnesium≤0.002%


Storage: Sealed and dry.

Uses: Acid-base neutralization to adjust pH value of solution. Basic chemical reagent, carbon dioxide absorber. Saponifier.

Hazardous properties: Class 8.2 alkaline corrosives.