Chlorosulphonic acid is a corrosive and clear liquid with molecular formula CISO2OH. It is a derivative compound of sulfuric acid (HOSO2OH) and highly soluble in chlorinated solvents. Chlorosulphonic Acid is used to produce organic sulphonic acids that are employed in detergents, pharmaceuticals, pesticides and dye industries. The other applications of chlorosulphonic acid are listed below: As sulphating agent.