International Research journal of Management Science and Technology

  ISSN 2250 - 1959 (online) ISSN 2348 - 9367 (Print) New DOI : 10.32804/IRJMST

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THE KINETIC STUDIES OF THE REACTION BETWEEN BROMINE AND MALIC ACID (INFLUENCE OF HYDROGEN ION CONCETRATION)

    1 Author(s):  SHARAD CHANDRA

Vol -  10, Issue- 4 ,         Page(s) : 236 - 242  (2019 ) DOI : https://doi.org/10.32804/IRJMST

Abstract

The kinetics of the oxidation of malic acid with bromine has been studied. The reaction was found to be of first order with respect to both bromine malic acid—the total order being two. The energy of activation, free energy and entropy of activation were found to be 14.0 K. cal./mole., 15.1 K. cal./mole. and - 3.6 e. u. at pH~8.75. The reaction rate increases, at first, with rise of pH, reaches a maximum at pH~9.40 and, then, decreases. The dependence of the rate of pH showed that HOBr is a faster oxidising agent than molecular bromine. The reactive species was found to be a combination of hypobromous acid and bromine molecule with kHOBr>>kBr2. The oxidation reaction can be represented by the attack of the oxidant on carboxylate ion.

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