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The effect of monohydroxy alcohols on the critical micelle concentration (CMC) of anionic and cationic surfactants have been studied by a conductometric method. The CMC was found to decrease by adding small quantities of alcohol and raised again at higher alcohol concentrations. The CMC decreasing effect has been discussed on the basis of more ordered water cavity formed around the added alcohol molecules and their increasing effect by the partition of alcohol between the micellar and the bulk phase leading to the break-down of the micelles. The effect of urea on CMC in alcohol–water mixtures has been studied and its CMC increasing effect explained.

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