Molar volume and apparent molar volume of copper(II) soap plus methano plus benzene system at various temperatures

Studies on density of copper(II) soaps in mixture of benzene + methanol at various temperatures (40,45,50,55 degreesC) have been made. The cmc values in higher volume percent of methanol are higher than those in higher volume percent of benzene, With regard to chain length of soaps cmc values follow the order C6>C8. Masson equation has been applied successfully to interpre t apparent molar volume of copper soaps in benzene + methanol. The studies of temperature effect on various interactions suggest that interactions bet ween soap-solvent molecules increase with the rise in temperature when non- polar hydrocarbon is predominant in the solvent mixture whereas soap-soap i nteractions increase with the rise in temperature when methanol is predomin ant at below and above cmc.