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Investigating the effect of temperature on the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid.

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Introduction

Chemistry Coursework - Investigating the effect of temperature on the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid PLAN The rate of reaction is the rate of loss of a reactant or the rate of formation of a product during a chemical reaction. There are five factors which affect the rate of a reaction, according to the collision theory of reacting particles: temperature, concentration (of solution), pressure (in gases), surface are (of solid reactants), and catalysts. I have to investigate the effect temperature has on a reaction. Aim: To see the effects of a change in temperature on the rate of a reaction. The reaction that will occur is: Sodium Thiosulphate + Hydrochloric Acid Sodium Chloride + Sulphur + Sulphur Dioxide + Water A diagram to show what will happen when the reaction takes place. One experiment will be carried out involving changing the temperature (while everything else remains constant). The hydrochloric acid will be maintained at room temperature, and the temperature of the Thiosulphate will be varied to the necessary temperatures using both a Bunsen burner and ice. I decided which temperatures and concentration to use during my preliminary series of experiments. ...read more.

Middle

The results shown, however, in the previous table were the correct ones with the new-recorded rates of reactions and times. ANALYSING THE DATA Conclusion: From the results it is possible to observe that as the temperature is increased the time taken for the reaction to take place decreases. This means that the rate of reaction increases as it takes less time for the reaction to take place. In the 'time' graph (the graph showing temperature against time) the points have negative correlation. The graph, however, that shows temperature against rate of reaction has positive correlation - as the temperature increases so does the rate of reaction. This is because when the temperature is increased the particles will have more energy and this move faster. Therefore they will collide more often and with more energy. Particles with more energy are more likely to overcome the activation energy barrier to reaction and thus react successfully. Comparison: The conclusion that I have been able to draw from this experiment strongly agrees with the prediction that I made before starting the experiment in my plan. They both say that as the temperature increases, so does the rate of reaction. ...read more.

Conclusion

I would be even clearer about when the reaction was done, as this would also improve the accuracy of the experiment and the fairness of each trial. Possible Extensions: To expand the experiment there are certainly things that I could add and employ to make the experiment more constructive and also more explanatory on the effects of different variables on the rate of reaction. I could perhaps investigate the effect on stirring on the rate of reaction as well. After all, stirring the mixture is an important rate factor. I could also investigate the effect of surface area on the rate of reaction. I could test my hypothesis that id a solid reactant is broken down into smaller pieces the rate of reaction increases. Another experiment I could do in order to expand this experiment is the effect of concentration on the rate of reaction, or even the effect of pressure. I could also try the experiment with different acids to see if they also made a difference and to see whether or not there was a reaction with them at all, and if so what it was. I could also use more accurate equipment so that better results and more evidential, solid results could be obtained. Bunsen Burners are not brilliant for achieving certain temperatures. 2002 Rebecca Jordan Chemistry Coursework ...read more.

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