Investigating the Rate of the Reaction between Bromide and Bromate Ions in Acid Solution

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Investigating the Rate of the Reaction between Bromide and Bromate Ions in Acid Solution

In this investigation, I aim to fully investigate the factors affecting the rate of the reaction between bromide ions and bromate ions in acid solution. The equation of this reaction is given below:

5Br-(aq) + BrO3-(aq) + 6H+(aq) --> 3Br2 (aq) + 3H2O(l) (Equation 1.0.1)

I will attempt to find the rate equation for the reaction, in the form:

(Equation 1.0.2)

where k is the rate constant and x, y, and z are the orders of reaction with respect to Br-, BrO3- and H+ respectively. I will also attempt to find a suitable catalyst for the reaction, as well as the activation enthalpy for the reaction with and without a catalyst.

The reaction is a redox reaction: the bromide is oxidised to bromine and the bromate is reduced to bromine. This can be shown by the oxidation states of bromide, bromate and bromine:

5Br-(aq) + BrO3-(aq) + 6H+(aq) --> 3Br2 (aq) + 3H2O(l)

Oxidation State: -1 +5 -2 +1 0 +1 -2

I shall be using solutions of Potassium Bromide (KBr)