Thiosulfuric acid
From Wikipedia, the free encyclopedia
| Thiosulfuric acid | |
|---|---|
 |
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| 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 |
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Thiosulfuric acid is a sulfur oxoacid. The acid cannot be made by acidifying thiosulfate salts as the acid readily decomposes in water. The decomposition products can include, depending on the exact reaction conditions, sulfur, sulfur dioxide, hydrogen sulfide, polysulfanes, 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.
[edit] See also
- sulfur oxoacids for other sulfur oxoacids
[edit] Footnotes
Greenwood, N. N.; Earnshaw, A. (1997). Chemistry of the Elements, 2nd Edition, Oxford:Butterworth-Heinemann. ISBN 0-7506-3365-4.
