Disulfurous acid

Names

IUPAC name

disulfurous acid ^[1]

Other names

pyrosulfurous acid

Identifiers

ChEBI

CHEBI:29252^Y

ChemSpider

26062^Y

Jmol interactive 3D

InChI=1S/H2O5S2/c1-6(2)7(3,4)5/h(H,1,2)(H,3,4,5)^Y
Key: WBZKQQHYRPRKNJ-UHFFFAOYSA-N^Y
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

146.14 g mol⁻¹

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 (S₂O₇⁻), disulfite has two directly connected sulfur atoms. The oxidation state of the sulfur atom bonded to 3 oxygen atoms is +5 while oxidation number of other sulfur atom is +3.

References

↑ 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.
↑ Holleman, Wiberg: Inorganic chemistry Academic Press @ Google Books. 2001; pp. 537-540.

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