Abstract
A spectrophotometric technique has been used to determine the cetyltrimethylammonium bromide (CTABr) micellar binding constant (KS) of ionised phenyl salicylate (PS-) in the presence of a constant amount of inert salt (MX = NaBr or C6H5COONa). The values of KS at different [MX] follow an empirical relationship: KS = KS0/(1 + KX/S[MX]) where the magnitude of the empirical parameter KX/S is the measure of the ability of X- to expel S- (= PS-) from the CTABr micellar pseudophase to the aqueous pseudophase. The value of KX/S is nearly 13-fold larger for C6H5COO-than for Br-.
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