Calcium hydrogen sulfite

Structural formula
General
Surname	Calcium hydrogen sulfite
other names	E  227 Calcium disulfite Calcium bis (hydrogen sulfite) Calcium bisulfite
Molecular formula	Ca (HSO 3 ) 2
External identifiers / databases
CAS number 13780-03-5 EC number 237-423-7 ECHA InfoCard 100.034.007 PubChem 26268 Wikidata Q419619
properties
Molar mass	202.22 g mol −1
safety instructions
GHS labeling of hazardous substances no GHS pictograms H and P phrases H: no H-phrases P: no P-phrases
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Calcium hydrogen sulfite is a chemical compound , more precisely the "acid" calcium salt of sulphurous acid with the chemical formula Ca (HSO ₃ ) ₂ .

Extraction and presentation

Calcium hydrogen sulfite can be obtained by the action of sulfur dioxide on an aqueous lime solution . It is created (in addition to calcium sulfite ) during flue gas desulfurization .

${\displaystyle \mathrm {CaCO_{3}+2\ H_{2}SO_{3}\rightarrow Ca(HSO_{3})_{2}+H_{2}O+CO_{2}} }$

use

Calcium hydrogen sulfite is used as a food additive . It is used as an antioxidant , preservative and color stabilizer (especially for wines and dried fruits). It is also used in the form of an aqueous solution to dissolve lignin in the production of wood pulp and as a bleaching agent (discoloration of sponges), as an anti-chlorine agent and as a clarifying agent for beverages.

See also

• Potassium hydrogen sulfite
• Sodium hydrogen sulfite

Individual evidence

1. ↑ Entry on E 227: Calcium hydrogen sulphite in the European database for food additives, accessed on June 27, 2020.
2. ↑ There is not yet a harmonized classification for this substance . A labeling of calcium hydrogen sulphite in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), retrieved on July 28, 2019, is reproduced from a self-classification by the distributor .
3. ↑ Technologies to prevent sulfur emissions
4. ↑ Charles E.Mortimer and Ulrich Müller: The basic knowledge of chemistry , ISBN 3-13-484308-0 .