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Dithionous acid

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Dithionous acid
Names
IUPAC name Dithionous acid
Other names Hydrosulfurous acid; Hyposulfurous acid
Identifiers
CAS Number
3D model (JSmol)
ChEBI
ChemSpider
PubChem CID
CompTox Dashboard (EPA)
InChI
  • InChI=1S/H2O4S2/c1-5(2)6(3)4/h(H,1,2)(H,3,4)Key: GRWZHXKQBITJKP-UHFFFAOYSA-N
  • InChI=1/H2O4S2/c1-5(2)6(3)4/h(H,1,2)(H,3,4)Key: GRWZHXKQBITJKP-UHFFFAOYAX
SMILES
  • O=S(O)S(=O)O
Properties
Chemical formula H2S2O4
Molar mass 130.144 g/mol
Acidity (pKa) 0.35, 2.45
Conjugate base Dithionite
Related compounds
Related compounds Oxalic acid
Sodium dithionite
Potassium dithionite
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). checkY verify (what is  ?) Infobox references
Chemical compound

Dithionous acid is a sulfur oxoacid with the chemical formula H2S2O4. It has not been observed experimentally. It is the conjugate base of the dithionite dianion, S2O4. Dithionite is a well-known reducing agent.

Related compounds

  • Dithionic acid (H2S2O6), another unstable protonated sulfur oxide, derived from dithionate.

References

  1. Catherine E. Housecroft; Alan G. Sharpe (2008). "Chapter 16: The group 16 elements". Inorganic Chemistry, 3rd Edition. Pearson. p. 520. ISBN 978-0-13-175553-6.
  2. Drozdova, Yana; Steudel, Ralf; Hertwig, Roland H.; Koch, Wolfram; Steiger, Thomas (1998). "Structures and Energies of Various Isomers of Dithionous Acid, H2S2O4, and of Its Anion HS2O4- 1". The Journal of Physical Chemistry A. 102 (6): 990–996. Bibcode:1998JPCA..102..990D. doi:10.1021/jp972658d.


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