Calcium Sulphite
Description
Calcium sulphite (CaSO₃) is a white, crystalline inorganic compound, often encountered as the hemihydrate (CaSO₃·½H₂O) or tetrahydrate (CaSO₃·4H₂O), formed as the calcium salt of sulfurous acid.
Properties
It appears as a fine white powder with low water solubility (0.0043 g/100 mL at 18°C), melting around 600°C, and density near 2.33 g/cm³; it dissolves readily in acids with SO₂ evolution but is sparingly soluble in alcohols.
Production
Calcium sulphite precipitates from solutions of calcium salts and sodium sulphite or by desulfurization of flue gases (SO₂ absorption with lime), yielding industrial byproducts that are often oxidized to gypsum.
Main uses
Primarily used in water treatment, paper manufacturing (as a bleaching agent precursor), and flue-gas desulfurization; food-grade E226 acts as an antioxidant and preservative, though less common due to potential allergenicity.
Specifications
| Model No. | N-CH1527 |
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