Potassium bisulfite

Potassium bisulfite
IUPAC name
Potassium hydrogen sulfite
Other names
Potassium bisulfite, potassium bisulphite solution, sulfurous acid, monopotassium salt, monopotassium sulfite
7773-03-7 YesY
3D model (Jmol) Interactive image
ChemSpider 22889 N
ECHA InfoCard 100.028.973
EC Number 231-870-1
E number E228 (preservatives)
PubChem 23663620
Molar mass 120.1561 g/mol
Appearance White crystalline powder
Odor SO2
Melting point 190 °C (374 °F; 463 K) (decomposes)
49 g/100 mL (20 °C)
115 g/100 mL (100 °C)
Solubility insoluble in alcohol
Except where otherwise noted, 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


This article is issued from Wikipedia - version of the 6/7/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.