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Kinetics and mechanism of the oxidation of oxalic acid by potassium yetrabromoaurate (III)

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Chemistry in the news – Abstract The oxidation of oxalic acid by the potassium tetrabromoaurate(III) in 0.005≤ [H₂C₂O₄]≤0.07 mol dm^-3is studied by UV spectrophotometry in the temperature range of 293.2 – 313.2 K. Under pseudo-first-order conditions ([H₂C₂O₄]₀ ≥10[Au(III)]₀), it is first order in [Au(III)] and [H₂C₂O₄]. Both H⁺and Br^– retard the reaction. The reactive species for Au(III) is AuBr₃(H₂O). …

Kinetics and mechanism of ruthenium(III) catalyzed oxidation of isobutyl alcohol by cerium(IV) in acid medium

Abstract for news about chemistry – The kinetics and mechanism of ruthenium(III) catalyzed oxidation of isobutyl alcohol(IBA) by cerium(IV) in sulfuric acid media has been investigated by titrimetric technique of redox in the temperature range of 298-313K. It is found that the reaction is first-order with respect to Ce(IV) and Ru(III), and a positive fractional order with respect to IBA. It is found that the pseudo first-order ([IBA]>>[Ce(IV)]>>[Ru(III)]) rate constant k_obsincreases with the increase of [H⁺] but decreases with the increase of [HSO₄^–]. Under the protection of nitrogen, the reaction system can not initiate polymerization of acrylonitrile, indicating generation of free radicals. On the basis of the experimental results, a suitable mechanism has been proposed. The rate constants of the rate determining step together with the activation parameters were evaluated.
Keywords Ruthenium(III) ion; Cerium(IV) ion; Isobutyl alcohol(IBA); Catalytic Oxidization; Kinetics and mechanism

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