A Study of the Kinetics and Mechanism of Oxidation of L -Ascorbic Acid by Permanganate Ion in Acidic Medium
The kinetics and mechanism of oxidation of L -Ascorbic acid by permanganate ion in acidic medium have been studied at 25±1°C, I = 1.0 mol dm (NaClO ), (H ) =1x10 mol dm .The stoichiometry was observed 3 + 2 3 4 to be 2:5 in terms of mole ratio of permanganate ions and ascorbic acid consumed. The reaction shows dependence on acid concentrations and is first order in both the oxidant and the reductant. The proposed rate law is where a = 0.27 x 10 dm mol s and b = 0.38 dm mol s . 2 3 1 1 6 2 1 The result of spectroscopic investigations and kinetic studies did not implicate the formation of intermediate complex. An outersphere reaction pathway is proposed for this reaction.