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How temperature affects the rate of reaction between sodium thiosulphate and hydrochloric acid.

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Introduction

Temp Affecting Reaction Rate We are going to try to find out how temperature affects the rate of reaction between sodium thiosulphate and hydrochloric acid. Na2 S2 O3 + 2HCL ? S(s) + SO2 +NACL + H2O I am going to heat the sodium thiosulphate to five different temperatures, 0?c, 20?c, 40?c, 60?c and 80?c. The sodium thiosulphate concentration will be 20gm/litre. I have chosen this concentration because the results we will obtain will have a wider range. I think this is the case because when we performed the preliminary experiment of how concentration affects the rate of reaction, we came to the conclusion that sodium thiosulphate at 40gm/litre reacted faster than sodium thiosulphate at 10gm/litre. The 40 gm/litre reacted after 30 secs; 30gm/litre after 43 secs, 20gm/litre after 55 secs and 10gm/litre after 93 secs. These results would be ether too quick to precisely record, or too slow to have a range. ...read more.

Middle

Our preliminary results showed that the higher the concentration of sodium thiosulphate, the quicker the reaction, so in theory the highest temperature at 40gm/litre, the quicker the reaction compared to the lowest temperature at 10gm/litre. The results we obtained from our preliminary experiment were backed up by the collision theory: The more collisions between particles at a given time, the faster the reaction. This theory also helps me come to my prediction of the hotter the solution the quicker the reaction. Temp Affecting Reaction Rate Results: Temp ?c Time s (1st time) Time s (2nd time) 80 2.91 3.1 60 7.29 8.42 40 15.89 14.37 20 48.63 50.10 0 99.78 102.2 GRAPH ATTATCHED From my results I can clearly see that the heat affects the reaction rate massively, the hotter the solution the quicker the reaction. My results show this and there is a curve in the graph, which shows this also. ...read more.

Conclusion

I feel the way we performed the experiment was good enough to get useful results and it was an overall successful experiment. The two sets of results that I obtained were never further than three seconds apart from each other, which is close enough to rely on and base a good conclusion on. The results have been backed up by information, the collision theory and the prediction, which I feel is strong enough to reach the conclusion that I have. If I were to further my research into rate of reactions under different temperatures, I would conduct the same experiment, but maybe go into more detail such as different concentrations of sodium thiosulphate, or different amounts of hydrochloric acid, and also put the solution under a larger range of temperatures i.e. -20?c up to 100?c. Overall I feel that even this kind of experiment would produce the same pattern of results and I would still come to the same conclusion that I have. ...read more.

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