Basic information Safety Supplier Related

Thiosulfuric acid

Basic information Safety Supplier Related

Thiosulfuric acid Basic information

Product Name:
Thiosulfuric acid
Synonyms:
  • Thiosulfuric acid
  • sulfurothioic O-acid
  • Thiosulfuric acid (H2S2O3) (9CI)
  • Thiosulfuric acid (H2S2O3)
CAS:
13686-28-7
MF:
H2O3S2
MW:
114.13
Mol File:
13686-28-7.mol
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Thiosulfuric acid Chemical Properties

Density 
1.867±0.06 g/cm3(Predicted)
pka
-4.23±0.18(Predicted)
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Thiosulfuric acid Usage And Synthesis

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.

Thiosulfuric acidSupplier

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