Ammonium thiosulfate

Ammonium thiosulfate

Names
IUPAC name Diammonium thiosulfate
Other names Ammonium thiosulphate
Identifiers
CAS Number	7783-18-8 Y
3D model (Jmol)	Interactive image
ChemSpider	4807475 Y
ECHA InfoCard	100.029.074
PubChem CID	6096946
InChI InChI=1S/2H3N.H2O3S2/c;;1-5(2,3)4/h2*1H3;(H2,1,2,3,4) Y Key: XYXNTHIYBIDHGM-UHFFFAOYSA-N Y InChI=1S/2H3N.H2O3S2/c;;1-5(2,3)4/h2*1H3;(H2,1,2,3,4)
SMILES [O-]S([O-])(=O)=S.[NH4+].[NH4+]
Properties
Chemical formula	H8N2O3S2
Molar mass	148.20 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y  (what is YN ?)
Infobox references

Ammonium thiosulfate (ammonium thiosulphate in British English) is an inorganic compound. It is white crystalline solid with ammonia odor, readily soluble in water, slightly soluble in acetone and insoluble in ethanol and diethyl ether.

Ammonium thiosulfate is used in photographic fixer. It is a so-called rapid fixer, acting more quickly than sodium thiosulfate fixers. Fixation involves these chemical reactions (illustrated for silver bromide):

Ammonium thiosulfate is also used for leaching of gold and silver. It works with presence of copper as a catalyst here. This process is a nontoxic alternative gold cyanidation.

Ammonium thiosulfate can be used as a fertilizer. As suggested by some research studies it can be used as an additive to coal-waste mixtures to reduce formation of very dangerous dioxins and furans.