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Peroxymonosulfuric acid, H2SO5, also known as persulfuric acid, peroxysulfuric acid, or Caro's acid. In this acid, the S center adopts its characteristic tetrahedral geometry; the connectivity is indicated by the formula HO–O–S2–OH. It is one of the strongest oxidants known 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–S2–O–O–S2–OH.
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