Abstract

Densities and ultrasonic velocities are measured then the partial molar volumes and adiabatic compressibilities are calculated at various concentrations of aqueous solutions of sodium dodecyl sulphate , sodium cholate and sodium taurcholate. These three detergents are known to form aggregates called micelles at specific concentrations. These concentrations are given the name , critical micelle concentration (cmc). Due to the nonlinear behaviour of the thermodynamic partial molar parameters with detergent's concentration no quantitative conclusions could be drawn . However, a reasonable qualitative model is put forward to explain the results.

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