Abstract
The dissociation of ortho-chloro- and nitro-benzoic acids in water—DMSO mixtures (0.0 + 0.8 DMSO mole fraction) was studied by means of a linear combination of the ordinary polar, proximity polar, and steric effects. Enthalpic and entropic contributions to substituent effects for the ortho-derivatives were also examined. The dissociation of the ortho-chloro-derivatives appear to be mostly anion-controlled. However, for the ortho-nitro-derivatives, the steric inhibition of solvation on the undissociated molecules may also be involved in controlling the course of the reaction.
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