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Kinetics of the decomposition of hydrogen peroxide in the presence of ethylenediaminetetraacetatocerium(IV) complex
Affiliation:1. Comenius University in Bratislava, Department of Physical and Theoretical Chemistry, Faculty of Natural Sciences, 842 15 Bratislava, Slovakia;2. Institute of Inorganic Chemistry, Slovak Academy of Sciences, 845 36 Bratislava, Slovakia
Abstract:The rate of reaction of [Ce(EDTA)(OH)nn] with H2O2 in 0.10 M KNO3 solution was investigated at various temperatures. The presence of a peroxy intermediate is inferred from spectrophotometric measurements. The general rate equation,
></figure>is valid for pH 7-9 with <em>n</em>= 1 and 2 complexes involved. The rate constants <em>k</em><sub>l</sub> and <em>k</em><sub>2</sub> were determined at 25 °C to be 0.054 and 0.171 M<sup>−1</sup> s<sup>−1</sup> respectively. The corresponding activation enthalpies, as calculated from Arrhenius plots, were δ<em>H</em><sub>1</sub><sup>#</sup>= 51.3 ± 14.8 and δ<em>H</em><sub>2</sub><sup>#</sup>= 41.8 ± 5.3 kJ m<sup>−1</sup> and the activation entropies were δ<em>S</em><sub>1</sub><sup>#</sup>=-97 ± 47 and Δ<em>S</em><sub>2</sub><sup>#</sup>=−119±17 J K<sup>−1</sup> m<sup>−1</sup>.</td>
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