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Ion association and solvent interaction-conductance of 1-ethyl-4-cyano pyridinium iodide in aqueous-binary mixtures containing acetone and 1,4-dioxane at different temperatures

Conductance of 1-ethyl-4-cyanopyridinium iodide has been measured in the concentration range (7.8-19.1) x 10 - 4 mol dm - 3 in binary solvent mixtures of water and aprotic cosolvents (acetone and 1,4-dioxane) at differenttemperatures (293-308 K). The conductance data in all cases have been analysed by the Shedlovsky equation to obtain Ao and K A . Based on the composition dependence of Walden product, the influence of the mixed solvent composition on the solvation of ions has been discussed. The association constants, K A , are used to get information about the influence of solvent composition on the various equilibria present in the solution. Thermodynamic parameter, ΔH 0 , as a function of solvent composition has also been determined.