Peroxydisulfuric acid

Peroxydisulfuric acid
Names
	IUPAC names μ-peroxido-bis(hydroxidodioxidosulfur); peroxydisulfuric acid
	Other names Persulfuric acid, Peroxodisulfuric acid
Identifiers
CAS Number	13445-49-3 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:29268 ;
ChemSpider	22822 ;
PubChem CID	24413;
UNII	2RQ1860626 ;
CompTox Dashboard (EPA)	DTXSID00894926 ;
	InChI InChI=1S/H2O8S2/c1-9(2,3)7-8-10(4,5)6/h(H,1,2,3)(H,4,5,6) Key: JRKICGRDRMAZLK-UHFFFAOYSA-N ; InChI=1/H2O8S2/c1-9(2,3)7-8-10(4,5)6/h(H,1,2,3)(H,4,5,6)/f/h1,4H; InChI=1/H2O8S2/c1-9(2,3)7-8-10(4,5)6/h(H,1,2,3)(H,4,5,6) Key: JRKICGRDRMAZLK-UHFFFAOYAS;
	SMILES O=S(=O)(OOS(=O)(=O)O)O;
Properties
Chemical formula	H2O8S2
Molar mass	194.13 g·mol−1
Appearance	Colourless solid
Melting point	65 °C (149 °F; 338 K) (decomposes)
Solubility in water	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.

Formula

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)

Senning, Alexander (2006-10-30). Elsevier's Dictionary of Chemoetymology: The Whys and Whences of Chemical Nomenclature and Terminology. ISBN 9780080488813.
Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
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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