Potassium bisulfite
 | |
| Names | |
|---|---|
| IUPAC name
Potassium hydrogen sulfite | |
| Other names
Potassium bisulfite, potassium bisulphite solution, sulfurous acid, monopotassium salt, monopotassium sulfite | |
| Identifiers | |
7773-03-7  | |
| 3D model (Jmol) | Interactive image |
| ChemSpider | 22889  |
| ECHA InfoCard | 100.028.973 |
| EC Number | 231-870-1 |
| E number | E228 (preservatives) |
| PubChem | 23663620 |
| UNII | QJK5LO891P |
| |
| |
| Properties | |
| KHSO3 | |
| 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). | |
| verify (what is ?) | |
| 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]
Synthesis
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
References
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