Iodine Clock Reaction
Kinetics of the Harcourt-Essen Reaction
Name: Manpreet Kaur
Candidate Number: 7123
AS and A2 Aims:
AS AIMS:
1. Investigate the effect of temperature on the rate of reaction.
For this aim 3 sets of results will be obtained by timing how long it takes for the colour change to occur in different temperatures determined by the use of an electric water bath. With these results, the effect of temperature on the rate of reaction will be investigated.
2. Determine the activation enthalpy with and without the catalyst ammonium molybdate(VI) and with different protic acids and use this to compare the effectiveness.
To find out which catalyst is most effective, this aim will be carried out as an iodine clock reaction. The goal of this aim is to find out what catalyst is best to make this reaction occur at the fastest rate.
3. Determine the effects of the presence of ethanol on the rate equation.
It is known that ethanol effects hydrogen peroxide and therefore it has an effect on the rate equation. This aim will find out the effect of ethanol by carrying out the iodine clock reaction with and without ethanol present and the results will be compared to draw a conclusion.
A2 AIMS:
4. Investigate the order of reaction with respect to hydrogen peroxide, iodide and acid.
The goal of this aim is to find out what order of reaction each chemical produced by making a graph for each of the reactants and analysing the line of best fit.
5. Investigate the rate equation, rate constant and possible mechanism for this reaction.
Investigating the possible mechanism will depict why the reaction occurs as it does. This aim is theory based and it will inform as to how the chemicals react and how this forms the products. By finding the rate equation, the dependence of rate on the concentration can be worked out. The rate constant will help to work out the rate equation.
6. Determine how
Name: Manpreet Kaur
Candidate Number: 7123
AS and A2 Aims:
AS AIMS:
1. Investigate the effect of temperature on the rate of reaction.
For this aim 3 sets of results will be obtained by timing how long it takes for the colour change to occur in different temperatures determined by the use of an electric water bath. With these results, the effect of temperature on the rate of reaction will be investigated.
2. Determine the activation enthalpy with and without the catalyst ammonium molybdate(VI) and with different protic acids and use this to compare the effectiveness.
To find out which catalyst is most effective, this aim will be carried out as an iodine clock reaction. The goal of this aim is to find out what catalyst is best to make this reaction occur at the fastest rate.
3. Determine the effects of the presence of ethanol on the rate equation.
It is known that ethanol effects hydrogen peroxide and therefore it has an effect on the rate equation. This aim will find out the effect of ethanol by carrying out the iodine clock reaction with and without ethanol present and the results will be compared to draw a conclusion.
A2 AIMS:
4. Investigate the order of reaction with respect to hydrogen peroxide, iodide and acid.
The goal of this aim is to find out what order of reaction each chemical produced by making a graph for each of the reactants and analysing the line of best fit.
5. Investigate the rate equation, rate constant and possible mechanism for this reaction.
Investigating the possible mechanism will depict why the reaction occurs as it does. This aim is theory based and it will inform as to how the chemicals react and how this forms the products. By finding the rate equation, the dependence of rate on the concentration can be worked out. The rate constant will help to work out the rate equation.
6. Determine how