Kinetic and Mechanism of Electron-Transfer Reactions: Silver (I) Catalyzed Oxidation of L-Ascorbic Acid by Peroxodiphosfate in Acetate Buffers
Narendra K. Soni,
Chandra L. Khandelwal,
Prem D. Sharma.
The kinetics of silver (I) catalyzed oxidation of l-ascorbic acid (H2A) by peroxodiphosfate (PDP) in acetate
buffers has been studied. Triple distilled water was employed to eliminate suspected trace metal-ion catalysis of Cu (II) or
Fe (III). The kinetics was monitored ceremetrically and the rate has been found to be independent of substrate concentration.
A plausible reaction mechanism has been suggested. Results were analysed graphically in view of complex rate
equation. The role of the catalyst has been via AgI/AgII redox cycle, Ag (II) confirming the presence of by the addition of
2,2’-bipyridyl where brown-orange color of AgI(bipy)2 complex of transient life time was observed.
Keywords: Catalysis, kinetics, L-ascorbic acid, mechanism, silver (I), peroxodiphosfate.
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