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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.
Additional recommended knowledge
H2SO5 was first described by Heinrich Caro, for whom it is named.
Synthesis and production
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").
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 acetones because of its ability to peroxidize the compound, creating a highly unstable molecule such as Acetone Peroxide.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Peroxymonosulfuric_acid". A list of authors is available in Wikipedia.