The reaction between persulphate ions and iodide ions is very slow in the absence of a catalyst. It can be speeded up considerably by the presence of either iron(II) ions or iron(III) ions in the solution.
S_(2)O_(8)^(2-)+2I^(-)->2SO_(4)^(2-)+I_(2)
a) What type of catalysis is this? b) Why is the reaction so slow in the absence of a catalyst? c) Use equations to help you to explain what happens in the presence of iron(II) ions. [Ans: homogenous, higher
E_(a)
and collision between 2 negative ions]

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The reaction between persulphate ions and iodide ions is very slow in the absence of a catalyst. It can be speeded up considerably by the presence of either iron(II) ions or iron(III) ions in the solution.

S_(2)O_(8)^(2-)+2I^(-)->2SO_(4)^(2-)+I_(2)

a) What type of catalysis is this? b) Why is the reaction so slow in the absence of a catalyst? c) Use equations to help you to explain what happens in the presence of iron(II) ions. [Ans: homogenous, higher

E_(a)

and collision between 2 negative ions]

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