Product Name
Ammonium thiosulfate
Description
Ammonium thiosulfate is a white crystalline solid. It is very soluble in water. The primary hazard is the threat posed to the environment. Immediate steps should be taken to limit its spread to the environment. It is used in photography, in chemical analysis, and for many other uses.;Liquid
IUPAC Name
diazanium;dioxido-oxo-sulfanylidene-ж╦6-sulfane
Molecular Weight
148.21g/mol
Molecular Formula
H8N2O3S2
Canonical SMILES
[NH4+].[NH4+].[O-]S(=O)(=S)[O-]
InChI
InChI=1S/2H3N.H₂O3S2/c;;1-5(2,3)4/h2*1H3;(H2,1,2,3,4)
InChI Key
XYXNTHIYBIDHGM-UHFFFAOYSA-N
Boiling Point
Decomposes (NTP, 1992)
Melting Point
Decomposes at 302° F (NTP, 1992);150 °C (DECOMP)
Density
2 at 68 °F (USCG, 1999);1.679
Solubility
64 % at 68° F (NTP, 1992);VERY SOL IN COLD WATER; IN 100 CC OF WATER: 103.3 G @ 100 °C; SLIGHTLY SOL IN ACETONE;INSOL IN ALCOHOL, ETHER
Color/Form
COLORLESS, MONOCLINIC CRYSTALS;WHITE CRYSTALS
Corrosivity
Copper-base alloys are seriously corroded by ... ammonium thiosulfate with corrosion rates exceeding 10 kg/(square meter year) at 100 °C.;High silicon cast iron has reasonable corrosion resistance /to ammonium thiosulfate/ with a corrosion rate < 4.4 kg/(square meter year) at 100 °C.;The corrosion rate for stainless steels /to ammonium thiosulfate/ is < 440 g/(square meter year) at 100 °C.
Covalently-Bonded Unit Count
3
Decomposition
Decomposed by heat
Exact Mass
147.997634g/mol
Monoisotopic Mass
147.997634g/mol
Other Experimental
Hygroscopic;No hydrates /of ammonium thiosulfate/ are known.
Stability
Solutions decompose slowly below 50 °C and more rapidly at higher temperatures. The anhydrous salt decomposes above 100 °C to sulfite and sulfur.
Vapor Pressure
0 mm Hg (NTP, 1992)
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