摘要：ABSTRACT: Ultrasonic studies of cerium and thorium palmitate in benzene methanol mixture were used to determine the CMC , soap solvent interaction and various acoustic parameters, inter-molecular free-length, adiabatic compressibility, apparent molar compressibility, specific acoustic impedance, molar sound velocity, solvation number, available volume and relative association at different temperatures. The results showed that these soaps behave as weak electrolytes in dilute solutions and the values of the CMC increase with the increasing temperature. Keywords: Critical micellar concentration; Ultrasonic velocity; Acoustic parameters; Soap-solvent interactions.
