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I'm currently writing the evaluation for my course work on the iodine clock reaction based on the reaction between potassium iodide and potassium peroxodisulphate(VI). As part of my investigation I had to try and find the activation enthalpy. I've looked every where for a data value for this so I can compare my answer to it but can't find one!

The ILPAC Resource Pack for Advanced Practical Chemistry (published by Hodder/Murray) has sample results which lead to the value of the activation energy, in the absence of a catalyst, of 52.9 kJ mol-1.

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updated: 25 February 2004

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