Calcium sulfite

Calcium sulfite
IUPAC name Calcium sulfite
Other names Sulfurous acid, calcium salt (1:1) E226
Identifiers
CAS number	10257-55-3 Y
PubChem	159274
ChemSpider	8329549 Y
Jmol-3D images	{{#if:[Ca+2].[O-]S([O-])=O|Image 1
SMILES [Ca+2].[O-]S([O-])=O
InChI InChI=1S/Ca.H2O3S/c;1-4(2)3/h;(H2,1,2,3)/q+2;/p-2 Y InChI=1/Ca.H2O3S/c;1-4(2)3/h;(H2,1,2,3)/q+2;/p-2 Key: GBAOBIBJACZTNA-NUQVWONBAU
Properties
Molecular formula	CaSO3
Molar mass	120.17 g/mol
Melting point	600 °C; 1,112 °F; 873 K
Solubility in water	0.0043 g/100 mL, 18C
Hazards
EU Index	Not listed
Flash point	Non-flammable
Related compounds
Other anions	Calcium sulfate
Other cations	Sodium sulfite
N (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 sulfite, or calcium sulphite, is a chemical compound which is the calcium salt of sulfurous acid with the molecular formula CaSO₃. As a food additive it is used as a preservative under the E number E226. It is commonly used in preserving wine, cider, fruit juice, canned fruit and vegetables.

CaSO₃ is not a desirable compound in drywall due to its long-term chemical instability.

References