Calcium sulfite

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White powder. Calcium sulfite is used for bleaching paper pulp and textiles. It is also used as an antichlor, disinfectant, and food preservative.


  • American Elements: SDS

Physical and Chemical Properties

Soluble in acids with the evolution of sulfur dioxide. Slightly soluble in water, ethanol.

Composition CaSO3-2H2O
Melting Point 100 C
Molecular Weight mol. wt. = 120.14
Refractive Index 1.590, 1.595, 1.628

Resources and Citations

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 132
  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 1755
  • CRC Handbook of Chemistry and Physics, Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980 Comment: ref. index=1.545, 1.560, 1.605