Non-ideal behaviour of benzene solutions of tri-n-octylammonium bromide and cyclohexanol

Abstract

The practical osmotic coefficients for the benzene–tri-n-octylammonium bromide–cyclohexanol system have been determined by the cryoscopic method and expressions for the activity coefficients of both solutes in the ternary system have been deduced. The regression coefficients for these expressions have been obtained via the Gibbs–Duhem relation. The effects of different media on the solute activity coefficients have been elucidated by the total, primary and secondary medium effects. In addition, values of the partial molar Gibbs free energy of transfer at infinite dilution of tri-n-octylammonium bromide for various constant concentrations of cyclohexanol and vice versa have been determined, together with the limiting value of their derivatives.