Peroxydisulfuric Acid
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Peroxydisulfuric Acid
Peroxydisulfuric acid
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Names
IUPAC names
?-peroxido-bis(hydroxidodioxidosulfur)
peroxydisulfuric acid
Other names
Persulfuric acid, Peroxodisulfuric acid
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
Properties
H2O8S2
Molar mass  g·mol-1
Appearance Colourless solid
Melting point 65 °C (149 °F; 338 K) (decomposes)
soluble
Conjugate base Peroxydisulfate
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 after its inventor Professor Hugh Marshall,[1] it is a sulfur oxoacid.[2] 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:[3]

2ClSO3H + H2O2 -> H2S2O8 + 2 HCl

Another method is the electrolysis of moderately concentrated sulfuric acid (60-70%) with platinum electrodes at high current density and voltage:

H2SO4 + H2O -> H3O+ + HSO4- (dissociation of sulfuric acid)
2HSO4- -> H2S2O8 + 2e- (E0 = +2.4V) (bisulfate oxidation)
2H2SO4 -> H2S2O8 + H2 (overall reaction)
3H2O -> O3 + 6H+ (ozone produced as a side product)

See also

References

  1. ^ Senning, Alexander (2006-10-30). Elsevier's Dictionary of Chemoetymology: The Whys and Whences of Chemical Nomenclature and Terminology. ISBN 9780080488813.
  2. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
  3. ^ Harald Jakob, Stefan Leininger, Thomas Lehmann, Sylvia Jacobi, Sven Gutewort. "Peroxo Compounds, Inorganic". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a19_177.pub2.CS1 maint: multiple names: authors list (link)



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