Volumetric and Ultrasonic Studies for the Binary Mixture (1, 4-Dioxane + Chloroform) at T = 295.15, 298.15, 301.15, 304.15, 307.15, 310.15, and 313.15 K

Abstract

The density ρ and speed of sound u for the binary mixture (1,4-dioxane (1) + chloroform (2)) were measured over the whole composition range of 1,4-dioxane at temperatures T = 295.15, 298.15, 301.15, 304.15, 307.15, 310.15, and 313.15 K and at atmospheric pressure. The experimental data were used to calculate the excess molar volume $V_m^E$, isobaric thermal expansion coefficient α_p, excess isobaric thermal expansion coefficient ${\alpha }_p^E$, excess speed of sound u^E, isentropic compressibility κ_s, excess of isentropic compressibility ${\kappa }_s^E$, intermolecular free-length L_f, the excess intermolecular free-length $L_f^E$, acoustic impedance Z, and the excess acoustic impedance Z^E. It was observed that some parameters, including α_p, κ_s, L_f, and Z decrease with increasing 1,4-dioxane mole fraction, while u is in increase. The physicochemical and acoustical parameters indicate the behavior of molecules as temperature increases. The magnitude of intermolecular interactions among the components of the mixtures reflects the nature of the substances. The excess parameters were fitted by using the Redlich–Kister polynomial equation to obtain coefficients and estimate standard error values. Thermodynamic properties can be used to analyze and understand the nature of molecular interactions between two components in a studied mixture.