BINARY-SYSTEMS OF TETRACHLOROETHYLENE WITH BENZENE, TOLUENE, PARA-XYLENE, CARBON-TETRACHLORIDE, AND CYCLOHEXANE - 1. ULTRASONIC VELOCITIES AND ADIABATIC COMPRESSIBILITIES AT 293.15 AND 303.15 K, DIELECTRIC-CONSTANTS AT 298.15 AND 308.15 K, AND REFRACTIVE-INDEXES AT 298.15 K
Measurements of ultrasonic velocities and adiabatic compressibilities at 293.15 and 303.15 K, dielectric constants at 298.15 and 308.15 K, and refractive indexes at 298.15 K have been made for binary liquid mixtures of tetrachloroethylene (C2Cl4) with benzene, toluene, p -xylene, carbon tetrachloride, and cyclohexane. The values of the quantity ksE, which refers to the deviations of the adiabatic compressibilitles of the mixtures from the ideal mole fraction mixture law values, have been calculated and have been fitted by the method of least squares to the equation kSE = x1x2[A + B(x1 − x2) + C(x1 − x2)2] where x1 refers to the mole fraction of C2Cl4, xx refers to the mole fraction of aromatic hydrocarbon, CCl4, or c-C6H12, and A, B, and C are constants which are characteristic of a system. For the systems C2Cl4-aromatics at 293.15 and 303.15 K, the values of kSE at x1, = 0.5 have the sequence benzene > toluene > p -xylene. The values of the quantity Δϵ, which refers to the deviations of the dielectric constants of the mixtures from the ideal volume fraction mixture law values, have also been calculated. The values of Δϵ at 298.15 K are found to be sightly negative or zero for all of the systems, and, at 308.15 K, the values are less negative or slightly positive. The values of the dipole moments of cyclohexane, carbon tetrachloride, and p -xylene, as determined from the dielectric constant and refractive index data for their dilute solutions in C2Cl4, have been found to be 0.04, 0.26, and 0.12 D, respectively. 1982, American Chemical Society. All rights reserved.