Problem 7: Iodination Inquiry

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This resource, from the Royal Society of Chemistry, can be used to develop students’ understanding of rate equations and skills in calculating rate determining steps.

A teacher asks the students to help in designing a clock reaction to determine the rate-determining step in the iodination of propanone. Students are expected to trial some different combinations of initial concentrations of reactants in order to determine which of the four steps is the rate-determining step.

They then use these trials to provide a detailed experimental Student Worksheet. In addition, the students are required to provide the associated results analysis, together with a set of model results indicating the rate determining step and a full rate equation for the reaction. It is expected that students will carry out three repeats of each experiment to ensure accuracy.

Curriculum links: rate equations, rate determining step

Practical skills: clock reactions, accuracy

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