Abstract
The solvational behaviour of 2- and 3-substituted bromo- and iodo-benzoic acids have been examined from the solubility of the acids and the dissociation constants for the reaction HA = H + + A- (where HA is substituted benzoic acid) determined conductometrically using Fuoss-Kraus method in 2-propanol + water mixtures (0-87 mass% of 2-propanol). The changes in the solubility values depend on the hydrophobic character and the dielectric constant of the solvent medium. The Gibbs energy of transfer for anions have been determined from the relation ΔG° t , (dissn.) = ΔG° t (H + ) + ΔG° t (A - ) - ΔG° t (HA) using the previously determined values of ΔG° t (H + ). ΔG° t (A - ) values have been found to be increasingly positive in aquo-organic mixtures and the ΔG° t (A - ) values of the 3-compounds are considerably different from those of 2-compounds. The results are discussed in the light of solute-solvent Interactions. The effects of substitution on the interaction energies of anions have been determined.
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