Calcium bisulfite

Calcium bisulfite (calcium bisulphite) is an inorganic compound which is the salt of a calcium cation and a bisulfite anion. It may be prepared by treating lime with an excess of sulfur dioxide and water. As a food additive it is used as a preservative under the E number E227. Calcium bisulfite is an acid salt and behaves like an acid in aqueous solution. It is used in the sulfite process for producing paper from wood chips.[1]

Calcium bisulfite
Names
IUPAC name
Calcium hydrogen sulfite
Other names
Calcium bisulphite
E227
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.034.007
E number E227 (preservatives)
RTECS number
  • EV9294500
UNII
  • InChI=1S/Ca.2H2O3S/c;2*1-4(2)3/h;2*(H2,1,2,3)/q+2;;/p-2 Y
    Key: LVGQIQHJMRUCRM-UHFFFAOYSA-L Y
  • InChI=1/Ca.2H2O3S/c;2*1-4(2)3/h;2*(H2,1,2,3)/q+2;;/p-2
    Key: LVGQIQHJMRUCRM-NUQVWONBAX
  • OS(=O)[O-].OS(=O)[O-].[Ca+2]
Properties
Ca(HSO3)2
Molar mass 202.22 g/mol
Melting point 203 °C
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y verify (what is YN ?)
Infobox references

See also

References
  1. Patt, Rudolf; Kordsachia, Othar; Süttinger, Richard; Ohtani, Yoshito; Hoesch, Jochen F.; Ehrler, Peter; Eichinger, Rudolf; Holik, Herbert; Hamm (2000). "Paper and Pulp". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a18_545.
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