Abstract
Publisher Summary Fluorosulfuric (fluorosulfonic) acid has been known since 1892, when it was prepared by Thorpe and Kirman ( I ) by reacting sulfur trioxide and anhydrous hydrogen fluoride. The compound may be considered to SOa+HF + HSOaF be derived by the replacement of an OH group in H2S04 by the isoelectronic F. It is of a particular great interest, since it and mixtures of it with SbF 5 and SO 3 are among the strongest acids known. Its physical and chemical properties commend it as a medium for a variety of experimental approaches. The radical formed by the oxidation of its anions, as well as its anhydride is a particularly useful synthetic reagent. The anhydrous acid is a colorless liquid, which fumes in moist air. It may be conveniently handled in glass apparatus, provided it is free of excess hydrogen fluoride. It may easily be purified by distillation. Traces of excess SO 3 result from the distillation process. They can be removed by adding an equivalent amount of HF.
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