Disulfite

Disulfite ion
Names
	IUPAC name disulfite
	Systematic IUPAC name pentaoxido-1κ3O,2κ2O-disulfate(S—S)(2−)
	Other names metabisulfite ion; pyrosulfite
Identifiers
CAS Number	23134-05-6 ;
3D model (JSmol)	Interactive image;
ChemSpider	140610;
PubChem CID	159940;
UNII	7992SO049K;
CompTox Dashboard (EPA)	DTXSID70945813 ;
	InChI InChI=1S/H2O5S2/c1-6(2)7(3,4)5/h(H,1,2)(H,3,4,5)/p-2 Key: WBZKQQHYRPRKNJ-UHFFFAOYSA-L;
	SMILES [O-][S+2]([O-])([O-])[S+]([O-])[O-];
Properties
Chemical formula	S; 2O2−; 5
Conjugate acid	Disulfurous acid
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

A disulfite, commonly known as metabisulfite or pyrosulfite, is a chemical compound containing the ion S
₂O²⁻
₅. It is a colorless dianion that is primarily marketed in the form of sodium metabisulfite or potassium metabisulfite. When dissolved in water, these salts release the hydrogensulfite HSO⁻
₃ anion. These salts act equivalently to sodium hydrogensulfite or potassium hydrogensulfite.

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