Ionic liquids are comprised entirely of ions and are liquids at temperatures below 373. I 5 K. They possess unique physicochemical properties, such as negligible vapor pressure, nontlammability, high ionic conductivity, and high thermal, chemical, and electrochemical stability, which make them so di stinct from conventional molecular liquids [ I]. In solution, the solvation and ionic association of ILs determine the unique properties of these systems and also most of the applications of ILs are closely related to these phenomena occurred in the IL solutions. Although fLs because of their ionic nature form strong ion pairs in both the liquid state and the gas phase, systematic quantitative studies on the ionic association in IL solutions from the different thermodynamic properties are still scarce [2 , 3]. Herein a systematic study of conductance properties of solutions of ionic liquid l-hexyl-3- methylimidazolium chloride ([C6mim][Cl]) in various molecular solvents has been made at different temperature in order to study of ionic association and solvation behavior of [C6mim][Cl] as well as their variation with the physicochemical properties of the molecular solvents.
