Thiosulfate

Thiosulfate
Names
	IUPAC names Sulfurothioate; Trioxidosulfidosulfate(2−); Trioxido-1κ3O-disulfate(S—S)(2−);
Identifiers
CAS Number	14383-50-7 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:16094;
ChemSpider	1054;
PubChem CID	1084;
UNII	LLT6XV39PY ;
CompTox Dashboard (EPA)	DTXSID80932118 ;
	InChI InChI=1S/H2O3S2/c1-5(2,3)4/h(H2,1,2,3,4)/p-2 Key: DHCDFWKWKRSZHF-UHFFFAOYSA-L;
	SMILES [O-]S(=O)(=S)[O-];
Properties
Chemical formula	S2O2−3
Molar mass	112.12 g·mol−1
Conjugate acid	Thiosulfuric acid
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Thiosulfate (IUPAC-recommended spelling; sometimes thiosulphate in British English) is an oxyanion of sulfur with the chemical formula S₂O2−3. Thiosulfate also refers to the compounds containing this anion, which are the salts of thiosulfuric acid, e.g. sodium thiosulfate Na₂S₂O₃. Thiosulfate also refers to the esters of thiosulfuric acid. The prefix thio- indicates that the thiosulfate is a sulfate with one oxygen replaced by sulfur. Thiosulfate is tetrahedral at the central S atom. Thiosulfate salts occur naturally. Thiosulfate ion has C_3v symmetry, and is produced by certain biochemical processes. It rapidly dechlorinates water and is notable for its use to halt bleaching in the paper-making industry. Thiosulfate salts are mainly used in dying in textiles and the bleaching of natural substances.

Sodium thiosulfate, commonly called hypo (from "hyposulfite"), was widely used in photography to fix black and white negatives and prints after the developing stage; modern "rapid" fixers use ammonium thiosulfate as a fixing salt because it acts three to four times faster. Some bacteria can metabolise thiosulfates.

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