Synthesis and Production
The laboratory scale preparation of Caro's acid involve the combination of chlorosulfuric acid and hydrogen peroxide.
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- 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").
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- H2O2 + H2SO4 ⇌ H2SO5 + H2O
Read more about this topic: Peroxymonosulfuric Acid
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