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# Investigating the effect of changing the concentration on the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid

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Introduction

Investigating the effect of changing the concentration on the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid Introduction In this experiment, I am trying to find out if the concentration of sodium thiosulphate determines the rate of reaction in this experiment. To do this I will change the concentration of the thiosulphate to see if it makes any difference, keeping the amount of acid at 5cm�. There are other factors that can affect the rate of reaction like the temperature, if the temperature is increased then the particles move faster with more energy. If the temperature is decreased the particles will move more slowly, therefore there will be a slower rate of reaction. To keep the temperature constant I will make sure the heating in the room is at the same temperature for each experiment and I will do the experiments on the same day, at the same time. Our preliminary work was carried out in year ten when we were doing the rates of reaction unit. ...read more.

Middle

4. Keep looking through the top of the flask, when you cannot see the cross stop the stop clock. 5. Repeat with different concentrations of thiosulphate. Diagram Results table Results Exp No. Concentration (molar) Vol of Thiosulphate (cm�) Vol of water (cm�) Vol of acid (cm�) Test (1) (Secs) Test (2) (Secs) Test (3) (Secs) Ave time (Secs) 1 1.0 50 0 5 33 34 30 32.3 2 0.8 40 10 5 40 36 40 38.7 3 0.6 30 20 5 65 56 60 60.3 4 0.4 20 30 5 100 80 90 90 5 0.2 10 40 5 225 230 235 231.3 Conclusion I found out that the concentration did affect the rate of reaction. When there was a high concentration there was a faster rate of reaction, when there was a low concentration of sodium thiosulpahte, the rate of reaction was slower. This was because in the high concentration there was more Sodium thiosulphate particles to collide with the acid particles, therefore there were more frequent collisions. ...read more.

Conclusion

This could have been helped if we had more time to carry out the experiment. I could improve my experiment in many different ways. I could use a wider range of concentrations for example 0.2m, 0.3m, 0.4m, 0.5m and so forth up to 3.0m. This would give me more results to compare. I could use different intervals between the concentrations for example 0.2, 0.4 and 0.6 I could use 0.2, 0.3, 0.4 this would give me a better set of results. If I had done the experiment more times to find a more accurate average, this would give me more accurate results. I could also try using concentrations that double such as 0.2 M, 0.4 M, 0.8 M to see if I could perhaps prove my second prediction. I think that although my results weren't perfectly accurate they were good enough to make a reliable conclusion. The results did agree with my predictions but I could have done the experiment more accurately. If I did the experiment again I would definitely use a wider range of concentrations in order to gain a more accurate set of results. ...read more.

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