Calcium sulfite

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Calcium sulfite
Calcium sulfite.png
Calcium sulfite ball-and-stick.png
CAS number 10257-55-3 YesY
PubChem 159274
ChemSpider 8329549 YesY
Jmol-3D images Image 1
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
EU Index Not listed
Flash point Non-flammable
Related compounds
Other anions Calcium sulfate
Other cations Sodium sulfite
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 N (verify) (what is: YesY/N?)
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.[1]

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


  1. ^ "Calcium Sulfite". ChemSpider. Chem Spider. Retrieved 12 August 2014.