The Effect of Temperature and Ionic Strength on the Oxidation of Iodide by Iron(III): A Clock Reaction Kinetic Study

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• 作者：Jurica Bauer ; Vladislav Tomi拧i膰 ; Petar B. A. Vrkljan
• 刊名：Journal of Chemical Education
• 出版年：2012
• 出版时间：March 13, 2012
• 年：2012
• 卷：89
• 期：4
• 页码：540-544
• 全文大小：241K
• 年卷期：v.89,no.4(March 13, 2012)
• ISSN：1938-1328

文摘

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 E_a, 螖H, and 螖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.

Keywords:

High School/Introductory Chemistry; Upper-Division Undergraduate; Inorganic Chemistry; Laboratory Instruction; Physical Chemistry; Hands-On Learning/Manipulatives; Kinetics; Mechanisms of Reactions; Thermodynamics