Thermodynamic study of ۱-heptyl-۳-methylimidazolium bromideionic liquid in water and dimethylformamide mixed solvent based onconductometric measurements

In this work, the electric conductivity (Λ) of ۱ -heptyl-۳ - methylimidazolium Bromide, [HpIm]Br in DMF +water mixed solvent have been measured at T = (۲.۸۹۲, ۳.۸۹۲ and ۳۱۸۹۲) K and P = .۹۱ MPa. Theconductometric measurements were performed for [HpIm]Br ionic liquid from .۹...۱ to .۹۲ mol kg− ۱in differentmass fractions of DMF in water mixtures ((w/w)% = wDMF /wmixture = ۱.۱), at T = (۲.۸۹۲ , ۳.۸۹۲ and ۳۱۸۹۲)K. Ion association constants (K ) and limiting molar conductivities (Λ. ) of [HpIm]Br were obtained by usingFuoss Onsager equation.