| Identification | Back Directory | [Name]
Thiosulfuric acid | [CAS]
13686-28-7 | [Synonyms]
Thiosulfuric acid
sulfurothioic O-acid
Thiosulfuric acid (H2S2O3) (9CI) | [Molecular Formula]
H2O3S2 | [MOL File]
13686-28-7.mol | [Molecular Weight]
114.13 |
| Hazard Information | Back Directory | [Physical properties]
Thiosulfuric acid is a sulfur oxoacid. The free acid
cannot be prepared by acidifying thiosulfate salts
as the acid readily decomposes in water. Anhydrous methods of producing
the acid are:
H2S＋ SO3→H2S2O3·nEt2O (in diethyl ether at 78°C)
Na2S2O3＋2HCl/2NaCl＋H2S2O3·2Et2O
(in diethyl ether at 78°C)
HSO3Cl＋H2S→HCl＋H2S2O3 (low temperature)
The anhydrous acid also decomposes below 0°C:
H2S2O3→H2S＋ SO3
There is another isomeric form, a white crystalline
adduct of hydrogen sulfide and sulfur trioxide, H2S·SO3, which can also be prepared at low temperature. | [Definition]
ChEBI: Sulfurothioic S-acid is a thiosulfuric acid. It has a role as a mouse metabolite. It is a conjugate acid of a hydroxidodioxidosulfidosulfate(1-). It is a tautomer of a sulfurothioic O-acid. |
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