Iodine Clock Reaction

5792 Words Feb 13th, 2013 24 Pages
Kinetics of the Harcourt-Essen Reaction

Name: Manpreet Kaur

Candidate Number: 7123

AS and A2 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
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Potassium permanganate is an inorganic compound which is a salt because it has k+ and MnO4- ions. The oxidizing ability of this compound is very strong and it dissolves in water to produce very dark purple solution. Potassium permanganate was formerly known as Condy’s crystals because the solution in water would evaporate to give prismatic crystals of a purple/black colour that glistened.

How the Rate of Reaction Varies:


According to the collision theory, every reaction has a minimum energy requirement for the molecules to begin reacting. Activation energy is the minimum energy required for the reaction to begin, the energy is required to break bonds and form new ones so that products can form. If two molecules collide with energy less than the activation energy then the molecules will not break any bond, which means no new bonds can form and therefore no reaction has taken place. Temperature affects the activation energy because by heating the reaction, molecules gain kinetic energy thus lowering the activation energy and therefore the reaction can take place faster because the kinetic theory states that molecules move faster. Faster moving molecules are more likely to collide with more energy than the activation energy and therefore thus the reaction takes place faster. Activation energy holds great importance
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