Kinetics and thermodynamic consequences of oxidation of mandelic acid by potassium bromate

ABSTRACT

The rate of oxidation of mandelic acid by potassium bromate in acetic acid-water medium was followed iodometrically under pseudo first orderconditions. The stoichiometry of the reaction was found to be 11; while the dependence of the rate of the reaction on the mandelic acid concentration is not a simple one. The effect of acidity on the rate of oxidation has been investigated in the light of the behaviour of the sulphuric acid in acetic acid-water medium. The effect of temperature on the reaction rate have been studied within the range 318-333 K for different acidities and solvent compositions. The thermodynamic properties of the activated complex, delta G[*], delta H[*] and delta S were computed and an extrathermodynamic analysis of the rate of the reaction was investigated according to the isokinetic relationship. A suitable reaction mechanisim was proposed