Peroxydisulfuric acid

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Peroxydisulfuric acid
IUPAC names
peroxydisulfuric acid
Other names
Persulfuric acid, Peroxodisulfuric acid
13445-49-3 N
3D model (Jmol) Interactive image
ChEBI CHEBI:29268 YesY
ChemSpider 22822 YesY
PubChem 24413
Molar mass 194.13 g·mol−1
Appearance Colourless solid
Melting point 65 °C (149 °F; 338 K) (decomposes)
Related compounds
Other cations
Potassium persulfate
Sodium persulfate
Ammonium persulfate
Related compounds
Peroxymonosulfuric acid
Pyrosulfuric acid
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

Peroxydisulfuric acid is the inorganic compound with the chemical formula H2S2O8. Also called Marshall's acid, it is sulfur oxoacid.[1] In structural terms it can be written HO3SOOSO3H. It contains sulfur in its +6 oxidation state and a peroxide group. Its salts, commonly known as persulfates, are industrially important as powerful oxidizing agents.

The acid is prepared by the reaction of chlorosulfuric acid with hydrogen peroxide:[2]

2ClSO3H + H2O2 → H2S2O8 + 2 HCl

See also[edit]

Peroxymonosulfuric acid


  1. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0-08-037941-9. 
  2. ^ Harald Jakob, Stefan Leininger, Thomas Lehmann, Sylvia Jacobi, Sven Gutewort (2005), "Peroxo Compounds, Inorganic", Ullmann's Encyclopedia of Industrial Chemistry, Weinheim: Wiley-VCH, doi:10.1002/14356007.a19_177.pub2