Calcium bisulfite

Calcium bisulfite

Names
IUPAC name Calcium hydrogen sulfite
Other names Calcium bisulphite E227
Identifiers
CAS Number	13780-03-5 Y
3D model (JSmol)	Interactive image
ChemSpider	24475 Y
ECHA InfoCard	100.034.007
E number	E227 (preservatives)
PubChem CID	26268
RTECS number	EV9294500
UNII	SNM7K02JP2 Y
CompTox Dashboard (EPA)	DTXSID50889620
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
Melting point	203 °C
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) 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 treating lime with an excess of sulfur dioxide and water. 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. It is used in the sulfite process for producing paper from wood chips.

See also

• Pulp (paper)
• Potassium bisulfite
• Sodium bisulfite