Molar conductance of lithium acetate, sodium acetate and potassium acetate were studied in aqueous 2-butanol solutions with an alcohol mass fraction (w(2)) of 0.70, 0.80 and 0.90 at 298.15, 303.15 and 308.15 K. The conductance data were analyzed with the Fuoss conductance-concentration equation to evaluate the limiting molar conductances (Lambda(0)), association constants (K-A,K-c) and cosphere diameter (R) for ion-pair formation. Gibbs energy (Delta G(0)), enthalpy (Delta H-0) and entropy (Delta S-0) for ion-association reaction were derived from the temperature dependence of K-A,K-c, Activation energy for ionic movement (Delta H-#) was derived from the temperature dependence of Lambda(0). Based on the composition dependence of Walden products (Lambda(0)eta(0)) and different thermodynamic properties (Delta G(0),Delta H-0, Delta S-0 and Delta H-#), the influence of the solvent composition on ion-association and solvation behavior of ions were discussed in terms of ion-solvent, ion-ion interactions and the structural changes in the mixed solvent media. (C) 2011 Elsevier B.V. All rights reserved.