Physical properties of the binary mixtures of ethanol + benzene and ethanol + pyridine at five temperatures under atmospheric pressure

Abstract

Experimental densities and speeds of sound at temperatures 293.15, 298.15, 303.15, 308.15, and 318.15 K and viscosities at 298.15 K are reported in this paper for the binary liquid mixtures of ethanol + benzene and ethanol + pyridine over the entire composition range and atmospheric pressure. From these experimental data, the excess molar volumes, VE, deviations in viscosity, ∆η, and isentropic compressibility ∆κs were calculated and fitted by the Redlich–Kister polynomial to determine the adjustable fitting parameters and the standard deviations. The optimal number of adjustable parameters to be included in a Redlich–Kister polynomial for fitting thermodynamic excess and deviation data has been determined through F-test. The variation of excess and deviation functions with composition and temperature has been interpreted in terms of molecular interactions between the components of the mixture and structural effects.