Acid—base titrations in aqueous micellar systems

Some water-insoluble carboxylic acids and amines have been titrated in aqueous surfactant solutions to demonstrate that solubilization in micelles provides a useful solvent system for certain acid—base titrations. Potentiometric titrations can be very slow because of electrode drift in these solutions, but visual titrations are convenient. Observed pK shifts are generally interpretable in terms of the influence of micellar charge on the work of proton removal.