Micellar and salt effects in kinetics of the reaction between phenolphthalein and hydroxyl ion
Abstract
Photocolorimetric method have been used for the determination of the effect of additions of NaBr (0.01 and 0.4 mol/l) and NaSal (0.4 mol/l) on the rate constants of the interaction between phenolphthalein and hydroxide ion in solutions containing ethanol (1.2 % vol.) and variable concentration (1∙10–5–10–2 mol/l) of various surfactants: Brij-35 (nonionic surfactant), sodium dodecyl sulfate (anionic surfactant), cetyltrimethylammonium bromide (cationic surfactants) and 3-(dimethyldodecylammonio)-propansulfonate (zwitterionic surfactant) in the presence of sodium bromide as inert electrolyte. The regularities of the rate constants obtained in micellar solutions of surfactants of various types in the presence of inert salts can be explained on the base of the following ideas: the distribution of the indicator between the aqueous phase and the micellar pseudo-phase; lower polarity of the medium at the locus of the indicator in the micelle; changing of the concentration of OH– ions in the Stern layer of the micelle depending on the charge on their surface, as well as by ion exchange equilibrium between the OH– ion and the anion of the added salt; primary salt effect, that influences the ions of the indicator located in the aqueous phase.
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References
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