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The dissociation constants and limiting molar conductances of benzoic and 2-, 3-, and 4nitrobenzoic acids have been determined in binary mixtures of water with acetone and tetrahydrofuran at 25 "C, respectively. The experimental data were analyzed by means of the Lee and Wheaton equation. The results are compared with those available in literature and in other water + cosolvent mixtures.

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Molar conductances of dilute solutions of 2-, 3-, 4-nitrobenzoic and benzoic acids are reported at 25°C in ethanol–water (EtOH–H2O) mixtures over composition range from 0 to 70 wt% of ethanol. The ionization constants and limiting molar conductances of these acids have been computed from the data using Fuoss 1978 conductance equation. Solvent effect on the ionization of acids in EtOH–H2O mixtures has been discussed in terms of free energy of transfer of respective anions of the acids from H2O to EtOH–H2O mixtures. It is found that the order of ionization of these acids in EtOH–H2O system is 2-nitrobenzoic acid>3-nitrobenzoic acid \simeq4-nitrobenzoic acid>benzoic acid.

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