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Essay Details:
Essay text:
Finding the order for each reactant
4. Finding the rate-determining step.
5. Proposing a mechanism for the reaction.
6. Using Arrhenius' equation to find the activation enthalpy.
Background
The basic reaction for this can be illustrated with the following equation:
3I-(aq) + H2O2(aq) + 2H+(aq) > I3-(aq) + 2H2O(aq) (1)
The half equations for this reaction can be written as follows:
3I- ? I3- + 2e-
H2O2 + 2H+ + 2e- ? 2H2O
This reaction demonstrates that iodide ions are oxidised by hydrogen peroxide to tri-iodide ions.
This is stage one of a sequence of reactions, which continues below:
I3¬-(aq) + 2S2O32-(aq) ¬? 3I-(aq) + S4O6-(aq) (2)
This shows that the tri-iodide ions are reduced back to iodide ions by the thiosulphate ions...
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