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Peroxymonosulfuric acid

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Title: Peroxymonosulfuric acid  
Author: World Heritage Encyclopedia
Language: English
Subject: Peroxydisulfuric acid, Sulfuric acid, Hydrogen sulfide, Peroxy acids, Persulfates
Collection: Hydrogen Compounds, Oxidizing Agents, Peroxy Acids, Persulfates, Sulfur Oxoacids
Publisher: World Heritage Encyclopedia

Peroxymonosulfuric acid

Peroxymonosulfuric acid
Skeletal formula of peroxymonosulfuric acid
Ball and stick model of peroxymonosulfuric acid
IUPAC name
Other names
Peroxomonosulfuric acid

Peroxysulfuric acid

Persulfuric acid
ChemSpider  Y
EC number 231-766-6
Jmol-3D images Image
UN number 1483
Molar mass 114.078 g mol−1
Appearance White crystals
Density 2.239 g cm−3
Tetrahedral at S
Main hazards strong oxidizer
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
 N  (: Y/N?)

Peroxymonosulfuric acid, (H2SO5), also known as persulfuric acid, peroxysulfuric acid, or Caro's acid, is a liquid at room temperature. In this acid, the S(VI) center adopts its characteristic tetrahedral geometry; the connectivity is indicated by the formula HO-O-S(O)2-OH. It is one of the strongest oxidants known (E0 +2.51 V) and is highly explosive.

H2SO5 is sometimes confused with H2S2O8, known as peroxydisulfuric acid. The disulfuric acid, which appears to be more widely used as its alkali metal salts, has the structure HO-S(O)2-O-O-S(O)2-OH.


  • History 1
  • Synthesis and production 2
  • Uses in industry 3
  • Dangers 4
  • See Also 5
  • References 6


H2SO5 was first described in 1898 by Heinrich Caro, after whom it is named.[2]

Synthesis and production

The laboratory scale preparation of Caro's acid involve the combination of chlorosulfuric acid and hydrogen peroxide.

H2O2 + ClSO2OH H2SO5 + HCl

Large scale production of Caro's acid is usually done on site, due to its instability. According to the patent by Martin, Caro's acid is produced by reacting >85% sulfuric acid and <50% hydrogen peroxide ("Piranha solution").[3]

H2O2 + H2SO4 H2SO5 + H2O

Uses in industry

H2SO5 has been used for a variety of disinfectant and cleaning applications, e.g., swimming pool treatment and denture cleaning. Alkali metal salts of H2SO5 show promise for the delignification of wood.[4]

Ammonium, sodium, and potassium salts of H2SO5 are used in the plastics industry as polymerization initiators, etchants, desizing agents, soil conditioner, and for decolorizing and deodorizing oils.

Potassium peroxymonosulfate, KHSO5, is the potassium acid salt of peroxymonosulfuric acid. It is widely used as an oxidizing agent.


Pure Caro's acid is highly explosive. Explosions have been reported at Brown University[5] and Sun Oil. As with all strong oxidizing agents, peroxysulfuric acid should be kept away from organic compounds such as ethers and ketones because of its ability to peroxidize the compound, creating a highly unstable molecule such as acetone peroxide.

See Also


  1. ^ "peroxysulfuric acid (CHEBI:29286)". Chemical Entities of Biological Interest. UK: European Bioinformatics Institute. 20 November 2007. Retrieved 17 November 2011. 
  2. ^ Caro, H. (1898). "Zur Kenntniss der Oxydation aromatischer Amine".  
  3. ^ Martin, P. L. (USA). U.S. Pat. Appl. Publ. (2005), 21 pp. CODEN: USXXCO US 2005031530 A1 20050210 Patent written in English. Application: US 2004-878176 20040628. Priority: US 2003-494009 20030807. CAN 142:179838 AN 2005:122569 CAPLUS
  4. ^ Springer, E. L.; McSweeny, J. D. (1993). "Treatment of softwood kraft pulps with peroxymonosulfate before oxygen delignification". Tappi Journal 76 (8): 194–199.  
  5. ^ J.O. Edwards (1955). "SAFETY".  
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