Studies on the Behaviour of Cobalt and Calcium Soaps. Part VII. Viscosity and Surface Tension Studies in Benzene and Carbon Tetrachloride

Department of Chemistry, D. A. V. College, Muzaffarnagar-251 001

Manuscript received 6 February 1981, accepted 11 August 1981

Viscosities and surface tensions of cobalt and calcium oleates in benzene and carbon tetrachloride solutions are determined at different temperatures (35-50°) The soaps form micellar aggregates and the critical micelle concentrations are found independent of temperature. The equations of Vend and Moulik are applicable only above CMC. The effects of temperature and concentration of soap on the fluidity of soap solutions are discussed in the light of Arrhenius and Eyring equations and activation parameters of viscous flow, \(\bigtriangleup\)H*, \(\bigtriangleup\)S* and \(\bigtriangleup\)G* have been calculated. The surface tensions of cobalt and calcium soap solutions are explained on the basis of Langmuir's expression : \( \gamma / \gamma\)_o = 1— X In C/Y ( which is used to calculate the surface area covered by the soap micelle formed from 1 mol of the soap at different temperature (35-50^°).