Peroxydisulfuric acid

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Peroxydisulfuric acid
CAS number 13445-49-3 N
PubChem 24413
ChemSpider 22822 YesY
ChEBI CHEBI:29268 YesY
Jmol-3D images Image 1
Molecular formula H2O8S2
Molar mass 194.14 g mol−1
Appearance Colourless solid
Melting point 65 °C (149 °F; 338 K) (decomposes)
Solubility in water soluble
Related compounds
Other cations Potassium persulfate
Sodium persulfate
Ammonium persulfate
Related compounds Peroxymonosulfuric acid
Pyrosulfuric acid
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 N (verify) (what is: YesY/N?)
Infobox references

Peroxydisulfuric acid is a sulfur oxoacid with the chemical formula H2S2O8.[1] It is also called Marshall's acid. In structural terms it can be written HO3SOOSO3H. It contains sulfur in its +6 oxidation state, but it also contains a peroxide group, which is why it appears to be in a higher oxidation state than sulfates. Its salts, commonly known as persulfates, are industrially important but the acid itself is not. The salts contain the peroxydisulfate ion. They are powerful oxidizing agents.

See also[edit]

Made up of hydrogen peroxide and sulfur trioxide or by electrolysis of sulfuric acid


  1. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0080379419.