Conductometric Study of 1-Propyl-3-methylimidazolium Bromide Ionic Liquid in Water and Ethylene Carbonate Mixtures

In this work, we reported the electrical conductivity measurements for 1-Propyl-3-methylimidazolium Bromide, [PrMIm]Br, in ternary mixtures of [PrMIm]Br + ethylene carbonate + H2O at T=(298.2, 308.2 and 318.2) K and P=0.1MPa. Conductometric measurements were carried out for [PrMIm]Br ionic liquid in ethylene carbonate + water solvent mixture in various composition 10, 20 and 30 mass% of ethylene carbonate (EC) in the ionic strength ranging from 0.0029 to 0.2500 mol.kg-1. The Fuoss-Onsager conductivity equation was used to obtain the limiting molar conductivity (Λ°) and ion association constant (KA) for under investigation system. Also, the values of critical micelle concentration (cmc) and the degree of ionization (α) were deduced from conductivity data and used to obtain the corresponding standard thermodynamic functions of micellization process including Gibbs free energy (ΔGm°), enthalpy (ΔHm°) and entropy (ΔSm°).