Measurements and Correlations of Electrical Conductivity of Some Aqueous Solutions of Ionic Liquids

Abstract

As part of our systematic study on physicochemical characterization of ionic liquids, here, we reported new measurements of electrical conductivity for aqueous solutions of four ionic liquids at normal atmospheric condition and for temperature up to 353.2 K. The considered ionic liquids were 1-butyl-3-methylimidazolium chloride [Bmim][Cl], 1-butyl-3-methylimidazolium bromide [Bmim][Br], 1-butyl-2,3-dimethylimidazolium tetrafluoroborate [Bdmim][BF4], and 1-butyl-2,3-dimethylimidazolium hexafluorophosphate [Bdmim][PF6]. The electrical conductivity was measured using a commercial conductivity meter with an estimated experimental uncertainty of ±1% with the calibrating solution as the reference. The present conductivity data were reported as functions of temperature and composition. A modified form of the Arrhenius equation was used to correlate the temperature and compositional dependence of the investigated systems and the results were satisfactory.