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Studies of CMC, Solute Solvent and Solute Solute interactions of Copper (II) Soaps Derived from Edible Oils in Methanol Benzene System at 303 K

Rashmi Sharma, Meenakshi Saxena, Renu Bhutra, Pragya Tank and M. R. K. Sherwani

Copper soaps prepared from various edible oils have been analyzed for their micellar characteristics in non-aqueous media with different polarities. The present work deals with the study of copper (II) mustard (CM) and soyabean (CSo) soap in 20% and 40% methanol – benzene system. Density of soap solutions of various concentrations has been measured and by using density data, molar volume and apparent molar volume has been evaluated in order to determine the critical micelle concentration (cmc) in different solvent compositions, nature and size of the micelles formed and to test the validity of Masson equation, which provides a plausible explanation for solute – solvent and solute – solute interactions with the variation in the polarity of the solvent. The cmc values have been found to be greater in higher volume percent of methanol than those in higher volume percent of benzene. It has been observed that apparent molar volume decreases with the increase in the polar content in the solvent mixture for both the soaps v (20%) > v (40%). The apparent molar volume for CM soap is found to be higher than that of CSo soap for both the solvent compositions. Further, it has been observed that as the number of ionic polar heads increases in the soap content, the solute – solvent interaction also increases in both solvent mixtures i.e. 0v2 (CSo) > 0v2 (CM)