Kinetics and Mechanism of Oxidation of L–ascorbic Acid by Silver (I) in Acid Perchlorate Medium

Narendra Kumar Soni; Riya Sailani; Prem Dutt Sharma

Volume : III, Issue : VII, July - 2014

Kinetics and Mechanism of Oxidation of L–ascorbic Acid by Silver (I) in Acid Perchlorate Medium

Narendra Kumar Soni, Riya Sailani, Prem Dutt Sharma

Abstract :

The kinetics of oxidation of l-ascorbic acid (H2A) by silver (I) has been studied in acid nitrate medium potentiometrically. The reaction is second order - first order with respect to oxidant and substrate respectively. The stoichiometry of the reaction is represented by eqn(1). 2Ag (I) + H2 A → 2Ag (0) + 2H+ + A (1) where �A� is dehydro ascorbic acid The kinetic rate law (2) corresponds to the proposed mechanism. (2)Energy and entropy of activation have also been evaluated.