Calcium bisulfite

Calcium bisulfite
IUPAC name Calcium hydrogen sulfite
Other names Calcium bisulphite E227
Identifiers
CAS number	13780-03-5 Y
PubChem	26268
ChemSpider	24475 Y
RTECS number	EV9294500
Jmol-3D images	{{#if:OS(=O)[O-].OS(=O)[O-].[Ca+2]|Image 1
SMILES OS(=O)[O-].OS(=O)[O-].[Ca+2]
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
Properties
Molecular formula	Ca(HSO3)2
Molar mass	202.22 g/mol
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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^{[citation needed]}, 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 bisuphite is an acid salt and behaves like an acid in its aqueous solution.

See also

• Pulp (paper)
• Potassium bisulfite
• Sodium bisulfite