Disulfurous acid

Disulfurous acid
Names
	IUPAC name disulfurous acid[1]
	Other names pyrosulfurous acid
Identifiers
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:29252 ;
ChemSpider	26062 ;
PubChem CID	28020;
CompTox Dashboard (EPA)	DTXSID40274768 ;
	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	146.14 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
₂O⁻
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

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 (2001). Inorganic Chemistry. Academic Press. p. 537–540.

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[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.

[Holleman-2] Holleman, Wiberg (2001). Inorganic Chemistry. Academic Press. p. 537–540.