Aim: To determine the activation energy of the reaction between bromide ion and bromate(V) ion in acid solution.

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  1. Aim:
    To determine the activation energy of the reaction between bromide ion and bromate(V) ion in acid solution.
  2. Theory:
    The progress of the reaction may be followed by adding a fixed amount of phenol together with some methyl red indicator. The bromine produced during the reaction reacts very rapidly with phenol. Once all the phenol is consumed, any further bromine bleaches the indicator immediately. So, the time for the reaction to proceed to a given point may be determined. Measuring the time, t, for the reaction to proceed to the same (small) extent at different temperatures. Then, a graph of ln against should be a straight line of gradient (using the Arrhenius equation). Therefore, we can determine he activation energy of the reaction between bromide ion and bromate(V) ion in acid solution.
    Equation for the reaction between phenol and bromine:
       
    C6H5OH (aq) + 3Br2 (aq)C6H2(OH)Br3 (aq) + 3 HBr (aq)
           (phenol)                                (2,4,6-tribromophenol)
  3. Chemicals:


  1. Apparatus:

  1. Procedure:
  1. Place 10.00 cm3 of 0.01 M phenol solution, 10.00 cm3 solution A and 10 drops of methyl red indicator into a boiling tube.
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  1. Place 5.00 cm3 of 0.5 M H2SO4 in the second boiling tube.
  2. Place both boiling tubes into a large beaker of water which is maintained between 49°C - 51°C by careful warming. Allow the contents of the tubes to reach the temperature of the water bath (± 1°C) and wait until the temperature remains to be constant.
  3. Pour the entire 5.00 cm3 H2SO4 into the clamped boiling tube, and swirl gently. .
  4. Keep the first boiling in the water bath throughout the experiment. Record the time (t) taken, to the nearest second, for the complete ...

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