The study of vapor-liquid equilibria of 1-ethyl-3-methyl imidazolium chloride and 1-butyl-3-methyl imidazolium chloride in lithium bromide aqueous solutions and their corresponding binary systems at 298.15Â K.

Osmotic and activity coefficient of mixed aqueous solutions, 1-ethyl-3-methyl imidazolium chloride (EmimCl) and 1-butyl-3-methyl imidazolium chloride (BmimCl) in lithium bromide and their corresponding binary aqueous solutions have been measured by the isopiestic method at a 298.15 K. From the obtained osmotic coefficient data vapor pressure values have also been determined for the ternary (EmimCl+LiBr+H2O) and (BmimCl+LiBr+H2O) and corresponding binary aqueous EmimCl, BmimCl and LiBr solutions. The osmotic coefficients for binary aqueous solutions were correlated to the Pitzer, Pitzer-Archer and TCPC models. From these data, the corresponding mean activity coefficient, γ± have been calculated. The activity coefficients of mixed electrolytes were calculated by Scatchard's neutral-electrolyte method.