Investigating The Rate Of Reaction Between Peroxydisulphate (Vi) Ions And Iodide Ions
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Title: Investigating The Rate Of Reaction Between Peroxydisulphate (Vi) Ions And Iodide Ions

Essay Details:

Subject: Science
Author: Barbara M
Date: March 26, 2015
Level: University
Grade: A
Length: 7 / 1964

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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