Kinetic studies of the oxidation of m-hydroxy benzoic acid(m-HBA) by sodium N-bromobenzenesulphonamide (Bromamine-B or BAB) has heen carried out in aqueous HC1O4 medium at (308±0.1K). The reaction shows first order dependence each on [BAB], [m-HBA] and catalyst [Ru(III)]. During the reaction, it is observed that there is an inverse first order with respect to [H+]. The rate remained unchanged with the variation in the ionic strength of the medium for [m-HBA]. The addition of benzene sulphonamide [BSA], which is one of the reaction products, had no significant effect on the reaction rate. Thermodynamic parameters were computed by studying the reaction at different temperatures (303±318K). The rate laws derived are in excellent agreement with the experimental results. A suitable mechanism has been proposed.
Key words : m-hydroxy benzoic acid, N-Bromobenzene sulphonamide, Ru(IIl), Perchloric acid, Kinetics and Mechanism.