Kinetics and mechanism of oxidation of hydroxylaminehydrochloride by vanadium (V) in the presence of sodium lauryl sulphate

Kinetics of oxidation of hydroxylaminehydrochloride in aqueous HClO4 medium has been studied at different temperatures both in the presence and absence of SLS. The kinetics shows first order dependence on both [NH2OH] and [V(V)] but change in ionic strength and [H+] have no effect on reaction rate. Decomposition of a precursor complex has been suggested as the slow step. The reaction is moderately catalysed by SLS and the catalysis has been rationalised by Menger and Portnoy model. Moderate binding constant value suggests that the precursor complex is bound to the micellar surface through hydrophilic binding. The kinetic data also fit into Piskziewicz model and conclusions drawn there from have limited significance.