Disulfurous acid
Names
IUPAC name
disulfurous acid[1]
Other names
pyrosulfurous acid
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
  • InChI=1S/H2O5S2/c1-6(2)7(3,4)5/h(H,1,2)(H,3,4,5) checkY
    Key: WBZKQQHYRPRKNJ-UHFFFAOYSA-N checkY
  • InChI=1S/H2O5S2/c1-6(2)7(3,4)5/h(H,1,2)(H,3,4,5)
  • O=S(=O)(O)S(=O)O
Properties
H2S2O5
Molar mass 146.14 g mol−1
Conjugate base Disulfite
Except where otherwise noted, 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 (S
2O2−
7), disulfite has two directly connected sulfur atoms. The oxidation state of the sulfur atom bonded to three oxygen atoms is +5 while that of the other is +3.

Disulfurous acid 1H 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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