Sulfite

Sulfite
	A space-filling model of the sulfite anion.
Identifiers
CAS Number	14265-45-3;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:17359;
ChemSpider	1068;
Gmelin Reference	1449
PubChem CID	1099;
UNII	15744271E9;
	InChI InChI=1S/H2O3S/c1-4(2)3/h(H2,1,2,3)/p-2 Key: LSNNMFCWUKXFEE-UHFFFAOYSA-L;
	SMILES [O-]S(=O)[O-];
Properties
Chemical formula	SO32−
Related compounds
Related ions	bisulfite; disulfite; sulfate; selenite; tellurite
Related compounds	sulfur dioxide; sulfur trioxide; sulfurous acid
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Sulfites or sulphites are compounds that contain the sulfite ion (systematic name: sulfate(IV) ion), SO₃²⁻. The sulfite ion is the conjugate base of bisulfite. Although its acid (sulfurous acid) is elusive, its salts are widely used.

Sulfites are substances that naturally occur in some foods and the human body. They are also used as regulated food additives. When in food or drink, sulfites are often lumped together with sulfur dioxide.