Partial molar volumes, partial molar expansibilities and viscosity of benzene solutions of tri-n-octylammonium halides

Abstract

The densities of benzene solutions of tri-n-octylammonium chloride, tri-n-octylammonium bromide and tri-n-octylammonium iodide up to 0.25 mol kg^–1 at 293.15, 298.15, 303.15, 313.15 and 323.15 K were measured. The partial molar volumes and partial molar expansibilities of the solutes were found to be independent of concentration, and the partial molar expansibilities were found to be equal for all the solutes investigated. For these systems viscosity measurements were also made and the viscosity coefficients B and D determined. In addition, the relative viscosity was interpreted on the basis of the theory of rate processes and regular solution theory, and thermodynamic functions of activation for viscous flow and the solubility parameters of the solutes investigated were calculated at 298.15 K.