Investigating The Rate Of Reaction Between Peroxydisulphate (Vi) Ions And Iodide Ions
Aims
The aims of this investigation are:
1. To find the rate equation of the reaction of hydrogen peroxide and iodide ions. This will be achieved by using an iodine clock method and colorimetric analysis.
2. Draw a graph of rate against concentration for each reactant (Hydrogen peroxide, potassium iodide and H+ ions).
3. 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)......
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Approximate Word Count: 1957
Approximate Pages: 8 (250 words per double-spaced page)
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