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An investigation into whether sodium Thiosulphate concentration affects the rate of reaction.

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Introduction

Chemistry coursework Robyn Hoaksey 11Oh Rates An investigation into whether sodium Thiosulphate concentration affects the rate of reaction. Prediction: I think that when there is a higher concentration of sodium thiosulphate the faster the reaction between sodium thiosulphate and hydrochloric acid will be. I think this because when there is a higher concentration of sodium thiosulphate, the more particles of sodium thiosulphate are and so more colliding with the acid making a faster reaction. Low Concentration of Sodium High Concentration of Sodium Thiosulphate. Thiosulphate. Preliminary Work: I thought that it would be best to have a test of the practical I would be doing. For this experiment, I took the highest and lowest amount of sodium thiosulphate. I also wanted to find out what amount of acid would be suitable for the experiment. We chose to use a 250ml beaker. This was so that the overall surface area would stay the same and would therefore keep the test fair. ...read more.

Middle

This was because the time taken was longer with the 10cm�. Although this reaction would have been sufficient for my experiments, I felt that if I used 15cm� of acid I would be able to do more experiments in less time. We also chose to do the experiments at room temperature, the temperature needs to be kept constant so that the reaction does not speed up or down. If this was to happen we would have to re-do the experiment. This is because it would not be a fair test. Method: > Collect equipment and set up as shown on the diagram > Add the 15cm� of acid to the beaker > Add the desired amount of solution (water and sodium thiosulphate) > Put the beaker on top of the X. > Time (with a stop clock) the time it takes for the X to become invisible > Record results and Repeat. ...read more.

Conclusion

Test 1 Test 2 Test 3 Average 25 59 59 X 59 20 66 70 X 68 15 90 85 X 87.5 10 180 176 X 178 5 360 363 X 361 Graph: Evaluation: During my experimenting, I found only one anomalous result. I noticed this result because it was not on the line of best fit. This could have been caused by the fact that we used different people to witness the cross disappearing. This gives different judging from the witnesses. To improve this I could use a light sensored data logger or a video camera. Another improvement would be to use a different glass beaker every time instead of washing the same one out after each experiment. This could leave some residue and cause to reaction to differ. Conclusion: My results showed that as more sodium thiosulphate is added, the faster the rate of reaction is. This is because more particles are colliding with the acid. In other words the collision theory. Low Concentration of Sodium High Concentration of Sodium Thiosulphate. Thiosulphate. There are more sodium thiosulphate particles reacting with the acid particles, making the reaction faster. ...read more.

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