Abstract
A conventional spectrophotometric technique was used to study the oxidation of thiourea by permanganate in a dilute perchloric acid solution. Preliminary observations indicate that the reduction of permanganate by thiourea proceeds through the fast formation of colloidal MnO 2 as an intermediate. Various experiments were performed to confirm the nature of intermediate(s) formed during the reduction of permanganate by thiourea. The kinetic and spectroscopic data are consistent with the formation of water-soluble colloidal MnO 2. The stoichiometry was found to be 1:2 (MnO 2:thiourea). The stability of water-soluble colloidal MnO 2 depends upon the [H +]. The effect of total [MnO 4 −], [thiourea] and [H +] on the reaction rate was determined. On the basis of various observations, a mechanism is proposed for the oxidation of thiourea by permanganate.
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