Thiosulfuric acid



Thiosulfuric acid
IUPAC name sulfurothioic O-acid
Other names thiosulfuric acid dihydroxidooxidosulfidosulfur
Identifiers
CAS number 7772-98-7
SMILES OS(=O)(=S)O
Properties
Molecular formula H2S2O3
Molar mass 114.14408
Solubility in water decomposes
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)
Infobox disclaimer and references

Thiosulfuric acid is a sulfuric acid and polythionates. Anhydrous methods of producing the acid include:

(in diethyl ether at -78°C )
H2S + SO3 → H2S2O3·nEt2O
Na2S2O3+2HCl→ 2NaCl + H2S2O3·2Et2O


The anhydrous acid decomposes below 0°C :

H2S2O3→ H2S + SO3

There is an isomeric form, a white crystalline adduct, H2S.SO3 which can be prepared at low temperature.

See also

Footnotes

Greenwood, N. N.; Earnshaw, A. (1997). Chemistry of the Elements, 2nd Edition, Oxford:Butterworth-Heinemann. ISBN 0-7506-3365-4. 

 
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