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See the effects of a change in temperature on the rate of a reaction.

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Introduction

Sodium Thiosulphate + Hydrochloric Acid Investigation 2HCl (aq) + Na2S2O3 (aq) Plan We must investigate the rate of reaction, and the effect different changes have on them. 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 chosen to investigate the effect temperature on a reaction. Aim To see the effects of a change in temperature on the rate of a reaction. The reaction that will be used is: Sulphur Sulphur Sodium Hydrochloric acid + Sodium Thiosulphate ppt dioxide gas Chloride Water Solution 2HCl (aq) + Na2S2O3 (aq) S (g) + SO2 (g) + 2NaCl (aq) + H20 (l) The experiment will be carried out by changing the temperature (while everything else remains constant).When the temperature is constant room temperature will be used as the temperature as it more practical and will not need to be monitored. ...read more.

Middle

All of these precautions will make my final results more reliable and keep anomalies at a minimum, making the entire investigation more successful. Prediction I predict that as the temperature is increased the rate of reaction will increase. This means that the graph drawn in my analysis will have positive correlation, and will probably be curved as the increase in rate of reaction will not be exactly the same as the temperature is increased. I can state this because of what I know about the collision theory. When the temperature is increased the particles will have more energy and thus move faster. Therefore they will collide more often and with more energy making it easier for the particles to break their bonds and form new ones, therefore increasing the rate of reaction as the temperature increases. 0C Obtaining Evidence Time (seconds) Temperature 0C First test Second test Third test Average time 5 83.5 84.87 80.05 82.8 15 71.47 67.7 75.93 71.7 20 51.07 56.48 58.01 55.1 25 50.87 49.57 48.95 49.7 35 22.05 23.65 22.47 22.7 Analysis In this experiment I have found that as the temperature is increased the time taken for the reaction to take place decreases. ...read more.

Conclusion

though administration etc, I know the results were accurate because they had a fairly strong, positive correlation, which means there was a good pattern in the results. However when anomalous data did occur, in the first test at 15oC the results showed 71.47, whereas at in the second test of the same temperature, the results showed 67.7. Although the difference of the data could change the overall accuracy of the results, we did not alter it due to not having enough time. I could improve my results by using a larger variation in temperature - I have only used five different temperatures; I would certainly get more reliable results and a better correlation between my results by using more temperatures. Repeating the experiment more times - I would definitely get more reliable results if I repeated them more times, I would get a higher range of results. As for the anomalous results I would carry out more tests to decrease or increase the average and the compare this with my original average to see which is the most reliable. Elliot Snape ...read more.

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