Calcium bisulfite

Calcium bisulfite (calcium bisulphite) is an inorganic compound which is the salt of a calcium cation and a bisulfite anion. It may be prepared by reacting lime with an excess of sulfurous acid, essentially a mixture of sulfur dioxide and water. It is a weak reducing agent, as is sulfur dioxide, sulfites, and any other compound containing sulfur in the +4 oxidation state. As a food additive it is used as a preservative under the E number E227. Calcium bisulfite is an acid salt and behaves like an acid in aqueous solution.

Calcium bisulfite
Names
IUPAC name
Calcium hydrogen sulfite
Other names
Calcium bisulphite
E227
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.034.007
E number E227 (preservatives)
RTECS number
  • EV9294500
Properties
Ca(HSO3)2
Molar mass 202.22 g/mol
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

See also

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