The degree of counterion binding (β) to micelles of aqueous n-alkylammonium chlorides (CAC; H(CH)NHCl, n = 8-12) was evaluated from the ionic activity coefficient (γ-), which was determined by use of a conventional chloride ion selective electrode at 25°C. In the γ- plot of CAC, a bend indicating the critical micelle concentration (cmc) was found, at concentrations above which the Botré plot was examined, and a value of 0.80 was determined for β. Very similar β values were obtained for the other alkylammonium chloride surfactants. The standard free energy of the micellization (ΔG) of CAC was estimated from the β and micellar aggregation numbers.
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