Rates of reaction - kinetics (A2)
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I can't seem to find the data book figure for the activation enthalpy of the iodine + peroxodisulphate clock reaction (data books used: Stark + Wallace, and Salters Datasheets) Can you tell me the figure for this?
I cannot give you a databook value but I can give you a value from the teacher's book for the ILPAC text about Advanced Practical Chemistry (John Murray, 1997 - ISBN 0719575087). These values are based on results obtained under the same sorts of conditions that you are likely to be working.
Uncatalysed activation energy: 53 kJ/mol
Catalysed by iron(III) ions: 35 kJ/mol
The book quotes a value from an article in the School Science Review [1975, 57, (198)] for the catalysed reaction with iron(III) of 28 +/- 2 kJ/mol.
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updated: 14 March 2004
