The critical micelle concentration, degree of dissociation, dissociation constant and thermodynamic parameters for dissociation and micellization processes for calcium myristate in a mixture of chloroform and propylene glycol of varying composition and different temperatures were evaluated from the conductivity measurements. The results showed that these soaps behave as weak electrolytes in dilute solutions and the values of the CMC increase with the increasing temperature. The ultrasonic measurements for calcium soaps have been carried out to determine the CMC, soap-solvent interaction and various acoustic parameters. The results showed that the ultrasonic velocity, specific acoustic impedance, apparent molal compressibility and molar sound velocity increase while the adiabatic compressibility, intermolecular free length and solvation number decrease with increasing soap concentration.