Thiosulfuric acid

Thiosulfuric acid[1]
Structural formula
Names
IUPAC name
Sulfurothioic S-acid[3]
Systematic IUPAC name
Dihydroxidooxidosulfidosulfur[3]
Other names
Thiosulfuric acid
Sulfurothioic O,O-acid[2]
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
UNII
  • InChI=1S/H2O3S2/c1-5(2,3)4/h(H2,1,2,3,4) checkY
    Key: DHCDFWKWKRSZHF-UHFFFAOYSA-N checkY
  • InChI=1/H2O3S2/c1-5(2,3)4/h(H2,1,2,3,4)
  • OS(=O)(=O)S
Properties[1][5]
H2S2O3
Molar mass 114.13 g·mol−1
Melting point decomposes below 0 °C
decomposes
Acidity (pKa)
Conjugate base Thiosulfate
Related compounds
Other cations
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Thiosulfuric acid is the inorganic compound with the formula H2S2O3. It has attracted academic interest as a simple, easily accessed compound that is labile. It has few practical uses.

  1. ^ a b Macintyre, Jane Elizabeth, ed. (1992), Dictionary of Inorganic Compounds, Chapman & Hall, p. 3362, ISBN 0-412-30120-2
  2. ^ ACD Chemsketch Name Free
  3. ^ a b International Union of Pure and Applied Chemistry (2005). Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005). Cambridge (UK): RSC–IUPAC. ISBN 0-85404-438-8. p. 139. Electronic version.
  4. ^ a b Perrin, D. D., ed. (1982) [1969]. Ionisation Constants of Inorganic Acids and Bases in Aqueous Solution. IUPAC Chemical Data (2nd ed.). Oxford: Pergamon (published 1984). Entry 239. ISBN 0-08-029214-3. LCCN 82-16524.
  5. ^ Page, F. M. (1953), "The dissociation constants of thiosulphuric acid", J. Chem. Soc.: 1719–24, doi:10.1039/JR9530001719