ESTIMATION OF EXCESS MOLAR VOLUMES, THEORETICAL VISCOSITIES, AND ULTRASONIC SPEEDS OF BINARY LIQUID MIXTURES AT DIFFERENT TEMPERATURES

Abstract

Excess molar volumes, , have been derived by using viscosity data for the binary mixtures of styrene (STY) with dimethylsulfoxide (DMSO), acetone (ACT), chlorobenzene (CB), and ethanol (EA) at different temperatures. From the literature data of viscosities, entropies, (ΔS*, and enthalpies, (ΔH*, of activation of viscous flow have been determined. Moreover, theoretical values of viscosities and ultrasonic speeds of the binary mixtures were calculated using different empirical relations and theories. The results were discussed in terms of deviations in experimentally and theoretically calculated values. The sign and magnitude of these parameters were found to be sensitive towards interactions prevailing in the studied systems. The predicted properties show good accuracy in comparison with the experimentally derived properties.

Keywords:

• Binary mixture
• Entropy and enthalpy
• Excess molar volume
• Molecular interactions
• Theoretical predictions
• Viscosity