Calcium bisulfite

Calcium bisulfite

Names
IUPAC name Calcium hydrogen sulfite
Other names Calcium bisulphite E227
Identifiers
CAS Number	13780-03-5 Y
3D model (Jmol)	Interactive image
ChemSpider	24475 Y
ECHA InfoCard	100.034.007
E number	E227 (preservatives)
PubChem	26268
RTECS number	EV9294500
InChI InChI=1S/Ca.2H2O3S/c;2*1-4(2)3/h;2*(H2,1,2,3)/q+2;;/p-2 Y Key: LVGQIQHJMRUCRM-UHFFFAOYSA-L Y InChI=1/Ca.2H2O3S/c;2*1-4(2)3/h;2*(H2,1,2,3)/q+2;;/p-2 Key: LVGQIQHJMRUCRM-NUQVWONBAX
SMILES OS(=O)[O-].OS(=O)[O-].[Ca+2]
Properties
Chemical formula	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

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.

See also

• Pulp (paper)
• Potassium bisulfite
• Sodium bisulfite