| IUPAC name
Potassium hydrogen sulfite
| Other names
Potassium bisulfite, potassium bisulphite solution, sulfurous acid, monopotassium salt, monopotassium sulfite
|3D model (Jmol)||Interactive image|
|E number||E228 (preservatives)|
|Molar mass||120.1561 g/mol|
|Appearance||White crystalline powder|
|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).
|(what is ?)|
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.
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.