Potassium bisulfite
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| Names | |
|---|---|
| IUPAC name
Potassium hydrogen sulfite
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Other names
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| Identifiers | |
3D model (JSmol)
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| ChemSpider | |
| ECHA InfoCard | 100.028.973 |
| EC Number |
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| E number | E228(preservatives) |
PubChemCID
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| UNII | |
CompTox Dashboard(EPA)
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| Properties | |
| KHSO3 | |
| Molar mass | 120.1561 g/mol |
| Appearance | White crystalline powder |
| Odor | SO2-like |
| Melting point | 190 °C (374 °F; 463 K) (decomposes) |
| 49g/100 mL (20°C) 115g/100 mL (100°C) | |
| Solubility | Insoluble in alcohol |
Except where otherwise noted, data are given for materials in theirstandard state(at 25 °C [77 °F], 100 kPa).
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Potassium bisulfite(orpotassium hydrogen sulfite) is achemicalmixture with the approximately correctly mentioned formulachemical formulaKHSO3.Potassium bisulfite in fact is not a actual compound,[1]but a mixture of salts that dissolve in water to give solutions composed of potassium ions and bisulfite ions. It is a white solid with an odor ofsulfur dioxide.Attempts to crystallize potassium bisulfite yieldpotassium metabisulfite,K2S2O5.[2]
Potassium bisulfite is used as a sterilising agent in the production of alcoholic beverages.[3]This additive is classified asE numberE228 under the current EU-approvedfood additivelegislation.[4]
Production
[edit]It is made by the reaction ofsulfur dioxideandpotassium carbonate.The sulfur dioxide is passed through a solution of the potassium carbonate until no more carbon dioxide is evolved. The solution is concentrated.
See also
[edit]References
[edit]- ^Tudela, David; Jenkins, H. Donald B. (2003). "New Methods to Estimate Lattice Energies: Application to the Relative Stabilities of Bisulfite (HSO3−) and Metabisulfite (S2O52-) Salts ".Journal of Chemical Education.80(12): 1482.Bibcode:2003JChEd..80.1482T.doi:10.1021/ed080p1482.
- ^Johnstone, H. F. (1946). "Sulfites and Pyrosulfites of the Alkali Metals".Inorganic Syntheses.Vol. 2. pp. 162–167.doi:10.1002/9780470132333.ch49.ISBN9780470132333.
- ^Barberá, José Jiménez; Metzger, Adolf; Wolf, Manfred (2000). "Sulfites, Thiosulfates, and Dithionitesl Chemistry".Ullmann's Encyclopedia of Industrial Chemistry.Weinheim: Wiley-VCH.doi:10.1002/14356007.a25_477.ISBN3527306730.
- ^"Approved additives and E numbers".Food Standards Agency.Retrieved2020-04-07.
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