Calcium bisulfite

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A yellow liquid with a strong sulfur dioxide odor. Calcium bisulfite is only known in solution. It is prepared by saturating calcium carbonate with sulfurous acid or by bubbling sulfur dioxide through a calcium hydroxide solution. Calcium hydrogen sulfite is used in the manufacturing of paper pulp to dissolve lignin and as a scavenger for chlorine. It is also used as a bleach, preservative, and disinfectant.

Synonyms and Related Terms

calcium hydrogen sulfite; calcium dihydrogen sulfite; calcium acid sulfite; lime bisulfite

Other Properties

Corrosive to metals.

Composition Ca(HSO3)2
Density 1.06

Hazards and Safety

Contact can be irritating and corrosive.

Sources Checked for Data in Record

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 1690