Determination and Modeling the Activity Coefficients of 1-Propyl-3- methylimidazolium Bromide in the Ethanol + Water Mixtures at T = (298.2, 308.2 and 318.2) K

In this work, the results of the mean activity coefficient measurements for ionic liquid of 1-propyl-3-methylimidazolium bromide, [prmim]br, in ethanol + water mixtures have been reported using potentiometric measurements at t = (298.2, 308.2 and 318.2) k. the electromotive force (emf) measurements were performed on the galvanic cell of the type: br-ise│[prmim] (m) ethanol (wt%), h2o (1 - wt)%│[prmim] - ise, in mixed solvent system containing 0, 10, 20, 30% mass fractions of ethanol over ionic strength ranging from 0.0010-2.0000 mol kg^-1. the pitzer ion-interaction model was used to analyze the activity coefficients for the studied system. the pitzer ion-interaction parameters (β^(0), β^(1) and c^ϕ) were determined and employed to calculate the mean activity coefficients, the osmotic coefficients, and excess gibbs free energies for the whole series of the studied system.