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Disulfurous acid

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Disulfurous acid
Names
IUPAC name disulfurous acid
Other names pyrosulfurous acid
Identifiers
CAS Number
3D model (JSmol)
ChEBI
ChemSpider
PubChem CID
CompTox Dashboard (EPA)
InChI
  • InChI=1S/H2O5S2/c1-6(2)7(3,4)5/h(H,1,2)(H,3,4,5)Key: WBZKQQHYRPRKNJ-UHFFFAOYSA-N
  • InChI=1S/H2O5S2/c1-6(2)7(3,4)5/h(H,1,2)(H,3,4,5)
SMILES
  • O=S(=O)(O)S(=O)O
Properties
Chemical formula H2S2O5
Molar mass 146.13 g·mol
Conjugate base Disulfite
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

Disulfurous acid, metabisulfurous acid or pyrosulfurous acid is an oxoacid of sulfur with the formula H2S2O5. Its structure is HO−S(=O)2−S(=O)−OH. 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. In contrast to disulfate (S2O2−7), disulfite has two directly connected sulfur atoms. The oxidation state of the sulfur atom bonded to three oxygen atoms is +5 and its valence is 6, while that of the other sulfur is +3 and 4 respectively.

Disulfurous acid H NMR spectrum.

References

  1. 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. 130. Electronic version.
  2. Holleman, Wiberg (2001). Inorganic Chemistry. Academic Press. pp. 537–540. ISBN 9780123526519.


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