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What effect does temperature have on the rate of a reaction?

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Introduction

What effect does temperature have on the rate of a reaction? Aim of this reaction To see the effects of a change in temperature and concentration on the rate of a reaction, The reaction that will be used is: Sodium Thiosulphate + Hydrochloric Acid Na2S2O3 (aq) + 2HCl (aq) Sodium Chloride + Water + Sulphur Dioxide + 2NaCl (aq) + H2O (l) + SO2 (g) + Sulphur S (s) For my experiment I am going to change the temperature of the solution. When the temperature is being varied a water bath will be used to heat up the acid and thiosulphate to the necessary temperature. The Chemistry Some chemical reactions, such as explosions, happen very quickly while others like rusting, occur very slowly. The rate of reaction can be affected by a number of factors: temperature, concentration and pressure, adding a catalyst, surface area/particle size and light. The one that I am going to be investigating and explaining about is Temperature. Changes in temperature change the kinetic energy of the particles and hence the numbers of successful collisions with enough energy to break existing bonds.. ...read more.

Middle

A graph can be produced to show these variations in energy and it is known as an energy distribution curve. Apparatus: * Sodium thiosulphate solution * Hydrochloric acid * 250cm conical flask * -5 C -110 C thermometer * 10cm /50cm measuring cylinder * Stop clock * Paper with a cross on it. Prediction As I explained earlier, the rate of a chemical reaction is the speed at which it takes place. Temperature is a major factor in this as increasing or decreasing the temperature changes the movement of particles in a substance therefore changing the rate of reaction. When a reaction mixture is heated up, each particle in it acquires more energy and collides more with other particles. Thus, from my prior knowledge and research, I can make the prediction that if you increase the temperature of a particular reaction, you increase the speed at which it takes place. This is simply because the particles carry more energy and collide more often where these collisions contain enough energy to break the energy barrier: When the temperature is raised, particles, when moving faster, collide with greater power. ...read more.

Conclusion

* I will repeat each experiment three times. I will do this to enable me to take an average which will be much more accurate then just doing the experiment. * I will use a burette to measure out the quantities using a burette. This will mean that we only have an error margin of +/- 0.1ml per measurement taken 12x0.1/10x100= 12% error due to burette measurement. * If my initial results are unsatisfactory I will ask to see another groups results, I will add these to my results and take an average to ensure more accurate results. * I will measure the volume of acid and thiosulphate in mls. I will measure the temperature in?C. I will measure time in seconds. * I will not do data manipulation to my results only if some data is anomalous and there is a definite pattern to the results that are accurate. Results table Temperature (?C) Time taken for X to disappear (Seconds) Experiment number: 1 2 3 10?c 20?c 30?c 40?c 50?c 60?c 70?c ?? ?? ?? ?? Christopher Murphy 11DC Chemistry Mr Allison ...read more.

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