The heats of formation of fluoro- and chloro-sulphuric acids and their thermodynamic stabilities
- 1 January 1967
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 1118-1121
- https://doi.org/10.1039/j19670001118
Abstract
The heat of formation of fluorosulphuric acid determined by mixing sulphur trioxide with excess of hydrogen fluoride in fluorosulphuric acid was 189·4 ± 0·6 kcal./mole at 25°. The heat of formation of chlorosulphuric acid determined by hydrolysing the acid was 142·9 ± 0·4 kcal./mole. The reaction of hydrogen chloride with excess of sulphur trioxide in fluorosulphuric acid yielded a confirmatory value of 143·5 ± 0·6 kcal./mole. The heats are combined with free energy functions to calculate the possible dissociation of the acids and these are compared with experiment.Keywords
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