Kinetics of the oxidation of hydrazine by chromium(VI)

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Abstract

Kinetic studies of the oxidation of hydrazine by chromic acid were made under various experimental conditions. The enthalpy and entropy of activation have been calculated to be 10·5 ± 0·5 kcal mole−1 and −24·5 ± 1·0 (e.u.) respectively and an attempt has been made to correlate activation parameters with those of the chromic acid oxidations of some phosphorus(III) and arsenic(III) compounds. The data suggest that oxidation follows formation of a complex between N2H5+ and the reacting species of chromium(VI) in the rate determining step. The decomposition of the complex by a fast step gives the reaction products. Various mechanistic possibilities have been suggested.

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