Abstract
Kinetics of oxidation of hydrazine sulphate and hydroxylamine by Co3+ in nitric and sulphuric acid media at 10–15° C. were studied. In H2SO4 medium, kinetic evidence was obtained for complex formation between Co3+-Substrate for both substrates whereas no such evidence was found in HNO3 medium. The effects of [H+], μ [HSO4 −], [SO4=], [Co2+] and temperature on the reaction rates were studied. An inverse dependence of the rates on [H+] was noticed in both media with both substrates but decreasing effect of [HSO4 −] was observed only with NH2OH in H2SO4 medium. Conclusions were drawn as to the nature of the active species: In H2SO4 medium for hydrazine sulphate, Co3+ (aq.) was concluded to be the active species; similarly for NH2OH, CoOH2+ was the active species. In HNO3 medium for both substrates CoOH2+ was the active oxidant. Nitrogen and Ammonia were found to be the products of oxidation with both substrates in both media. Stoichiometries were established and suitable mechanisms were proposed. The rate laws were formulated and the various equilibria and rate constants were evaluated.
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