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Salter's Chemistry A-Level Individual Investigation Report How does the activation enthalpy and the rate of the iodine-clock reaction vary with the concentration of reactants, catalysts, and the presence of different catalysts? Investigation How does the activation enthalpy and the rate of reaction vary with the concentration of reactants, catalysts, and the presence of different catalysts? Aim In this investigation I have set out to run a few standard tests and attempt to explain the mechanism by which the transition metal catalysts work in this particular instance. Theory The iodine-clock reaction. This reaction has been known for quite a long time, and it involves the oxidation of iodide ions to iodine molecules, which are soluble in water and will show its presence by a pale brown colour. The addition of starch to the reaction mixture makes the colour change far more visible by forming a dark-blue complex with iodine. The reaction can be represented by the...

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