Volumetric, ultrasonic, viscometric and refractive index behaviour of binary mixtures of styrene with ethylalcohol and chlorobenzene at different temperatures ( T = 298.15 K to 313.15 K)

Abstract

This paper presents experimental data for densities, ρ, viscosities, η, ultrasonic speeds, u, and refractive indices, n, of pure styrene (STY), chlorobenzene (CB), ethylalcohol (EA) and of their binary liquid mixtures over the entire composition range at 298.15, 303.15, 308.15, 313.15 K. The uncertainties in density, ultrasonic speed, viscosity, and refractive index measurements are ± 0.0001 g cm − 3 , ± 0.15 m s − 1 , ± 0.003 mPa s, and ± 0.0002 units, respectively. From these experimental data, excess molar volume, deviations in isentropic compressibility, viscosity and in refractive index and internal pressure are calculated for all the binary mixtures, over the entire composition range. The apparent molar volume, V ϕ ,2, and apparent molar compressibility, K ϕ ,2, of CB and EA in styrene were also calculated. Partial molar volume, V− ϕ ,2 0, and partial molar compressibility, K− ϕ ,2 0, were estimated by using the values of V ϕ ,2 and K ϕ ,2 of CB and EA in styrene at infinite dilution. The excess and deviation functions were fitted to Redlich and Kister type polynomial equation. Moreover, theoretical predictions of refractive index of the two binary mixtures are made on the basis of empirical and semiemperical relations by using the experimental values of the pure components. The results provide information on the molecules in the pure liquids as well as in the binary mixtures.