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Dithionous acid

Names
IUPAC name Dithionous acid
Other names Hydrosulfurous acid; Hyposulfurous acid
Identifiers
CAS Number	15959-26-9
3D model (JSmol)	Interactive image
ChEBI	CHEBI:29253
ChemSpider	22898
PubChem CID	24490
CompTox Dashboard (EPA)	DTXSID70274771
InChI InChI=1S/H2O4S2/c1-5(2)6(3)4/h(H,1,2)(H,3,4)Key: GRWZHXKQBITJKP-UHFFFAOYSA-N InChI=1/H2O4S2/c1-5(2)6(3)4/h(H,1,2)(H,3,4)Key: GRWZHXKQBITJKP-UHFFFAOYAX
SMILES O=S(O)S(=O)O
Properties
Chemical formula	H2S2O4
Molar mass	130.144 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Y verify (what is  ?) Infobox references

Dithionous acid is a sulfur oxoacid with the chemical formula H₂S₂O₄. It is unstable in pure form, but its salts, known as dithionites, are stable.

See also

• Potassium dithionite
• Sodium dithionite

References

1. Drozdova, Yana; Steudel, Ralf; Hertwig, Roland H.; Koch, Wolfram; Steiger, Thomas (1998). "Structures and Energies of Various Isomers of Dithionous Acid, H2S2O4, and of Its Anion HS2O4- 1". The Journal of Physical Chemistry A. 102 (6): 990. doi:10.1021/jp972658d. {{cite journal}}: no-break space character in |title= at position 95 (help)

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• Sulfur oxoacids
• Dithionites