Disulfurous acid

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Disulfurous acid
Dischweflige Säure.svg
PubChem 28020
ChemSpider 26062 YesY
ChEBI CHEBI:29252 YesY
Jmol-3D images Image 1
Molecular formula H2S2O5
Molar mass 146.14 g mol−1
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Disulfurous acid or pyrosulfurous acid is an oxoacid of sulfur with the formula H2S2O5. The salts of disulfurous acid are called disulfites or metabisulfites. Disulfurous acid is, like sulfurous acid (H2SO3), a phantom acid, which does not exist in the free state. [2] In contrast to disulfate (S2O7), disulfite has two directly connected sulfur atoms.


  1. ^ International Union of Pure and Applied Chemistry (2005). Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005). Cambridge (UK): RSCIUPAC. ISBN 0-85404-438-8. p. 130. Electronic version.
  2. ^ Holleman, Wiberg: Inorganic chemistry Academic Press @ Google Books. 2001; pp. 537-540.