A kinetic probe, which involves the determination of pseudo-first-order rate constants (k(obs)) for the nucleophilic reaction of piperidine (Pip) with ionized phenyl salicylate (S-) at constant [PiP](T) (=0.1 M), [S-](T) (= 2 x 10(-4) M), [CTABr](T), <= 0.10 M NaOH and varying concentration of MX (=3-ClC6H4CO2Na and C6H5CH=CHCO2Na), gives the following information. The nonlinear plots of k(obs) versus [MX] reveal indirectly the occurrence of more than one independent ion-exchange processes at the CTABr micellar surface. These observed data fit to a kinetic relationship derived from an empirical equation coupled with pseudophase micellar (PM) model. This relationship gives an empirical constant (K-X/S) that is used to determine the usual ion-exchange constant (K-X(Y)). The values of K-X(BR) (Y = Br) have been calculated for X = 3-ClC6H4CO2- and C6H5CH=CHCO2-. More than 12-fold larger value of K-X(Br) for X = 3-ClC6H4CO2- than that for X = 2-ClC6H4CO2- is attributed to the presence and absence of viscoelasticity in the respective presence of 3-ClC6H4CO2- and X = 2-ClC6H4CO2-