Department of Chemistry, University of Kalyani, Kalyani-741 235 Manuscript received 10 February 1982, revised 22 October 1982, accepted 23 April 1983 Accurate values of dissociation constants of benzoic acid in methanol + water and ethanol+water mixtures were determined using Fuoss-Kraus method. Accurate values of \(\wedge\)o of benzoic acid in different mixed solvents were determined from the relation \(\wedge\)o(benzoic acid) = \(\wedge\)o(HClO4) + \(\wedge\)o(C6H5COOK) - \(\wedge\)o(KClO4)

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... ilising the \(\wedge\)o values determined in the laboratory. The solubilities of benzoic acid in mixed solvents were determined. The free energies of transfer of uncharged acid,ΔG\(_t^o\) (HA), have been coupled with the free energies of transfer (ΔG\(_t^o\)) for the reaction HA\(\rightleftharpoons\)H+ +A- and ΔG\(_t^o\)(H+) values previously determined in the laboratory, to get ΔG\(_t^o\) of benzoate ion.