Study of Molecular Interactions in Aprotic-Aprotic Binary Mixtures Through Ultrasonic Measurements

Ultrasonic velocity and density for binary liquid mixtures of acetone+acetophenone, ethyl methyl ketone+acetophenone and acetone + ethyl methyl ketone have been measured at 308 K over the entire molar concentration range. From these measured parameters, adiabatic compressibility (K_S), inter molecular free length (L_f) acoustic impedance (Z), relative association (R_A) and excess adiabatic compressibility (K_S^E) along with excess intermodular free length (L^E_f) have been calculated. The thermodynamic parameters and their excess values are used to account for the molecular interactions taking place between the components of the mixtures. Further the experimental ultrasonic sound velocities of all these binary systems are compared with those evaluated theoretically from empirical, semi empirical and statistical models. The validity of these models is also checked and a comparative study of the various theories is made for these systems.