We present for the first time the determination of molar conductances, , of ionic liquids solutions(ILs) such as 1-ethyl-3-methylimidazolium tetrafluoroborate emimBF4 and 1-butyl-3- methylimidazolium tetrafluoroborate bmimBF4 as a function of temperature. The data was analyzedwith Barthel lcCM model to obtain ionic association constants, KA, limiting molar conductances, oof these electrolytes. The examined ionic liquids are practically fully dissociated in water over thewhole temperature range (283.15 to 318.15 K). From the temperature dependence of the limiting molarconductivities the Eyring activation enthalpy of charge transport was determined. The Waldenproduct values were also calculated.
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