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Kinetics and mechanism of oxidation of l ‐ascorbic acid by peroxomonophosphate in aqueous acid medium
Author(s) -
Soni Narendra K.,
Sailani Riya,
Khandelwal C. L.,
Sharma P. D.
Publication year - 2013
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.20741
Subject(s) - chemistry , dehydroascorbic acid , ascorbic acid , kinetics , aqueous solution , rate equation , stoichiometry , reaction mechanism , inorganic chemistry , reaction rate , catalysis , organic chemistry , physics , food science , quantum mechanics
The kinetics of oxidation of l ‐ascorbic acid (H 2 A) by peroxomonophosphate in acid aqueous medium has been studied. The stoichiometry of the reaction corresponds to the reaction as represented by the equation 1where A is dehydroascorbic acid. The reaction is second order versus first order with respect to each reactant. The rate is retarded by hydrogen ion concentration. A plausible reaction mechanism has been suggested. The derived rate law (2) from such a mechanism accounts for all experimental observations: 2Such pH dependence is somewhat different from that observed in the case of metal ion oxidants. © 2012 Wiley Periodicals, Inc. Int J Chem Kinet 45: 41–16, 2013