Practical investigations
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Hi, I am researching the iodine clock reaction between hydrogen peroxide and potassium iodide in acid solution. I cannot find any data on the activation enthalpy of this reaction anywhere. What is the activation enthalpy? and are there any reliable sources of this which I can find in the UK? thank you so much for your time, you're lifesavers!!
Ulex replies
We hope you have access to the Nuffield Book of Data. Page 119 gives a few activation energies and, as luck would have it, the one you want is there! The value given is 56.1 kJ mol-1 or 43.5 kJ mol-1 depending on which rate equation you choose – the rate equations are given, which might come in handy.
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updated: 20 January 2006
