The effect of temperature and ionic strength on the oxidation of iodide by iron(III): a clock reaction kinetic study

• Autores: Jurica Bauer, Vladislav Tomisic, Petar B. A. Vrkljan
• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 89, Nº 4, 2012, págs. 540-544
• Idioma: inglés
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• Resumen

  • A laboratory exercise has recently been reported in which the students use the initial rates method based on the clock reaction approach to deduce the rate law and propose a reaction mechanism for the oxidation of iodide by iron(III) ions. The same approach is used in the exercise proposed herein; the students determine the dependence of the reaction rate on ionic strength and temperature in a straightforward manner. The previously proposed mechanism is further supported by the results, the rate-determining step is identified, and the activation parameters Ea, H, and S are determined for the overall reaction of the first two steps of the mechanism. The significance of such kinetic studies in elaborating reaction mechanisms is clearly demonstrated to the students.