Thermoacoustical study of intermolecular interactions in binary liquid mixtures of benzaldehyde with methanol and ethanol

Abstract

Density (ρ) and ultrasonic velocity (u) for the binary mixtures of benzaldehyde with methanol and ethanol have been observed experimentally at 293, 303 and 313 K over the different compositions. The data so obtained was employed for the computation of specific heat ratio (γ), heat capacity (CP), effective Debye temperature (θD) and pseudo-Grüneisen parameter (Γ) excess pseudo-Grüneisen parameter (ΓE), excess molar volume (VmE) and excess isentropic compressibility (Δks) which were further endorsed to the Redlich-Kister polynomial equation. Excess parameters were graphed with the varying mole fraction of benzaldehyde and further considered for examining the nature and extent of molecular interaction in these two types of binary mixtures. The excess parameters with negative values in the observations were elaborated in terms of interaction between molecules of the constituents of the mixtures. The observed ultrasonic velocity and density were also fitted in first order polynomial equation. This research proves that the interaction between benzaldehyde and methanol is stronger than benzaldehyde and ethanol.