Synthesis
The industrial synthesis entails the reaction of hydrogen chloride with a solution of sulfur trioxide in sulfuric acid:
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- HCl + SO3 → ClSO3H
It can also be prepared by chlorination of sulfuric acid, written here for pedagogical purposes as SO2(OH)2, vs. the usual format H2SO4:
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- PCl5 + SO2(OH)2 → ClSO3H + POCl3 + HCl
The latter method is more suited for laboratory-scale operations.
Read more about this topic: Chlorosulfuric Acid
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