Potassium bisulfite

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Potassium bisulfite
Potassium bisulfite.svg
CAS number 7773-03-7 YesY
PubChem 23663620
ChemSpider 22889 N
EC number 231-870-1
Jmol-3D images Image 1
Molecular formula KHSO3
Molar mass 120.1561 g/mol
Appearance White crystalline powder
Odor SO2
Melting point 190 °C (374 °F; 463 K) (decomposes)
Solubility in water 49 g/100 mL (20 °C)
115 g/100 mL (100 °C)
Solubility insoluble in alcohol
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Potassium hydrogen sulfite or potassium bisulfite is a chemical compound with the chemical formula KHSO3. It is used during the production of alcoholic beverages as a sterilising agent. This additive is classified as E number E228 under the current EU approved food additive.[1]


It is made by the reaction of sulfur dioxide and potassium carbonate. The sulfur dioxide is passed through a solution of the potassium carbonate until no more carbon dioxide is given off. The solution is concentrated and then allowed to crystallize.

See also[edit]