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6.
Mechanism of Pd(II) Catalysed Oxidation of Lactic Acid by Chloramine-T
in Alkaline Medium: A Kinetic Approach
Abhishek Kumar, Kamini Singh and R.A. Singh*
*Department of Chemistry, Chemical Kinetics Research Laboratory,
T.D.P.G. College, Jaunpur - 222 002 (U.P.), India,
E-mail :
rasinghtdc@rediffmail.com
Abstract:
The kinetic investigation on Pd(II) catalysis in oxidation of
lactic acid by alkaline solution of chloramine-T has been
reported. The kinetic results indicate first-order in lower
concentration range of chloramine-T but at its higher
concentrations first-order tends to zero-order. First-order
dependence on concentration of both lactic acid and Pd(II) was
observed. The kinetic data showed negative effect of added
chloride ions, positive effect of variation of [OH–]
and zero effect of p-toluene sulphonamide on the rate of the
reaction. Insignificant effect of variation of ionic strength on
the rate was observed. Rate measurements at 30, 35, 40 and 45
0C led to compute activation parameters. A suitably
mechanism conforming to all the observed kinetic data has been
suggested and discussed.
Keywords: Kinetics, Mechanism, Oxidation, Chloramine-T, Lactic
Acid, Pd(II), Chloride.
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