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Kinetics and mechanism of oxidation of starch with sodium hypochlorite

✍ Scribed by K. F. Patel; H. U. Mehta; H. C. Srivastava

Publisher
John Wiley and Sons
Year
1974
Tongue
English
Weight
542 KB
Volume
18
Category
Article
ISSN
0021-8995

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✦ Synopsis

Kinetics of heterogeneous oxidation of starch with hypochlorite were studied under varying conditions of temperature, pH, buffer components, buffer concentration, and concentration of substrate and oxidant. The kinetic data show that the reaction is first order with respect to hypochlorite. A plot of first-order rate constant for varying starch concentrations versus starch concentration is linear. The rate of oxidation of starch is highest a t pH 7.0 and decreases with increasing acidity or alkalinity of the medium. In unbuffered system, pH of the medium decreases from 10 to 3.4 during the reaction. Based on observed trends of reaction rate, energy, and entropy of activation, a mechanism for hypochlorite oxidation of starch is proposed.

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