Abstract
Abstract The ultrasonic measurements of yttrium soaps were made in a mixture of 50% benzene and 50% dimethylsulfoxide (V/V) to determine the critical micelle concentration, soap-solvent interaction and various acoustic and thermodynamic parameters. The values of the CMC decrease with increasing chain length of fatty acid constituent of the soap molecule and are in agreement with the values obtained from other micellar properties. The various acoustic parameters (inter-molecular free-length, adiabatic compressibility, apparent molar compressibility, specific acoustic impedance, apparent molar volume, molar velocity, solvation number, available volume and relative association) for yttrium soaps (myristate, laurate, caprate and linoleate) have been evaluated by ultrasonic velocity measurements.
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