|Other names|| persulfuric acid, peroxysulfuric acid,|
|Molar mass||114.04 g/mol|
|Density||??? g/cm3, solid|
|Solubility in water||soluble|
|Main hazards||strong oxidizer|
| Except where noted otherwise, data are given for|
materials in their standard state
(at 25 °C, 100 kPa)
Infobox disclaimer and references
Peroxymonosulfuric acid, also known as persulfuric acid, peroxysulfuric acid, or as Caro's acid, is H2SO5, a colorless solid melting at 45 °C. 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.
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.
H2SO5 was first described by Heinrich Caro, for whom it is named.
Synthesis and production
- 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").
- 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.
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.
|The references in this article would be clearer with a different or consistent style of citation, footnoting, or external linking.|
- 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
- "Treatment of Softwood Kraft Pulps with Peroxymonosulfate Before Oxygen Delignification. Springer, E. L.; McSweeny, J. D. Tappi Journal (1993), 76, 194-9.cs:Kyselina peroxosírová
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