| Calcium sulfite | |
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Calcium sulfite |
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Other names
Sulfurous acid, calcium salt (1:1) |
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| Identifiers | |
| CAS number | 10257-55-3 |
| PubChem | 159274 |
| ChemSpider | 8329549 |
| Jmol-3D images | Image 1 |
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| Properties | |
| Molecular formula | CaSO3 |
| Molar mass | 120.17 g/mol |
| Melting point |
600 °C, 873 K, 1112 °F |
| 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 |
| (verify) (what is: /?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| 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.
Like other metal sulfites, calcium sulfite reacts with acids to produce a calcium salt, sulfur dioxide gas and water. For this reason, CaSO3 is not a desirable compound in drywall - when humid (with the natural acidity of carbon dioxide found in the air), it releases sulfur dioxide and carbon dioxide is absorbed to form calcium carbonate.
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