Calcium bisulfite

Calcium bisulfite
Names
	IUPAC name Calcium hydrogen sulfite
	Other names Calcium bisulphite; E227
Identifiers
CAS Number	13780-03-5 ;
3D model (JSmol)	Interactive image;
ChemSpider	24475 ;
ECHA InfoCard	100.034.007
E number	E227 (preservatives)
PubChem CID	26268;
RTECS number	EV9294500;
UNII	SNM7K02JP2 ;
CompTox Dashboard (EPA)	DTXSID50889620 ;
	InChI InChI=1S/Ca.2H2O3S/c;21-4(2)3/h;2(H2,1,2,3)/q+2;;/p-2 Key: LVGQIQHJMRUCRM-UHFFFAOYSA-L ; InChI=1/Ca.2H2O3S/c;21-4(2)3/h;2(H2,1,2,3)/q+2;;/p-2 Key: LVGQIQHJMRUCRM-NUQVWONBAX;
	SMILES OS(=O)[O-].OS(=O)[O-].[Ca+2];
Properties
Chemical formula	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).
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	Infobox references

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]

References

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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