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In this practical exercise the rate of the reaction between bromide ions and bromate (V) ions in acid solution at various temperatures is as follows: BrO3- (aq) + 5Br- (aq) + 6H+ (aq) 3H2O (l) + 3Br2 (aq)
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A level chemistry practical assessment Determination of an activation energy Introduction In this practical exercise the rate of the reaction between bromide ions and bromate (V) ions in acid solution at various temperatures is as follows: BrO3- (aq) + 5Br- (aq) + 6H+ (aq) 3H2O (l) + 3Br2 (aq) The end point of each reaction is determined by adding a fixed amount of phenol and a few drops of methyl red indicator to each reaction mixture. The bromine formed in the reaction immediately reacts with the phenol. When all the phenol has reacted any more bromine will bleach the indicator. The results of the measurements were used to plot a graph. The graph was used together with the Arrhenius equation to estimate a value for the activation energy for the reaction. Apparatus Solution A - Phenol Solution B - Br - / BrO3- Solution C - Dilute sulphuric acid Methyl red indicator 5 cm3 pipette 400 cm3 beaker 2 boiling tubes 2...
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