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The rate of the reaction between Sodium thiosulphate and Hydrochloric acid.

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Introduction

Chemistry Coursework I am going to do an investigation into the rate of the reaction between Sodium thiosulphate and Hydrochloric acid. I am going to change the concentration of the sodium thiosulphate. Prediction I predict that as the concentration of the sodium thiosulphate is increased the rate of reaction will also increase. The reaction between the 2 solutions will only happen when the particles collide. When the sodium thiosulphate is more concentrated there are more particles per cm^3 this means that the particles will collide more often because they are condensed more together. This means that the reaction between the two solutions will happen more often. The red dots in the diagrams below represent the sodium thiosulphate particles and the blue dots represent the hydrochloric acid particles. The diagrams represent the solution just after the sodium thiosulphate has been added. In diagram 1 you can see that there are less red particles than in diagram 2, this indicates that the sodium thiosulphate that was added is at low concentration. This means that solution 1 will take a longer amount of time to react then solution 2. ...read more.

Middle

Preliminary experiment For this test experiment I used a concentration of 10cm^3 of sodium thiosulphate and 0cm^3 of water, this makes the solution 40g/dm^3. I will then add 10cm^3 of hydrochloric acid. From this I can then predict what my results are going to be in the real experiment Results It took 59.3 seconds for the sodium thiosluphate to react with the hydrochloric acid so that I could not see the green dot anymore. The rate of the reaction was 0.01686 This experiment went well, I do not have any cause to drive me to change the equipment or alter the chemicals or their concentrations in any way. I can now move on to my real experiment. From this I can make a predication using the formula I have discovered from this preliminary experiment. Mathematical prediction I have discovered that the time for the reaction to happen and the concentration of the sodium thiosulphate are proportional to each other. This means that the rule for the time take for the reaction to happen will be: Time for the reaction for happen at 100% / the amount of sodium thiosulphate in1cm^3 before it is added to the hydrochloric acid. ...read more.

Conclusion

From my results I can make the conclusion that my formulae were correct. This also confirms my prediction that concentration is proportional to the rate of the reaction. My predictions were very close to the actual figures obtained by testing. Evaluation Taking into consideration experimental and human error I did not have an anomalous result. If I did they could have been caused by a number of things. * Could have been caused by apparatus not being cleaned properly and leaving water or acid in the measuring cylinders, this would have caused the solution to be contaminated. * I could have moved my head closer or further away from the experiment, causing the time I could see it to be reduced or increased. * I could have measured the amount of one of chemicals incorrectly causing the concentrations to be wrong. I could improve my experiment by using a set up the further reduces experimental and human error. I could do the experiment using a marble chip and hydrochloric acid at varying concentrations. This would improve the reliability of the experiment because the results would rest more on experimental data than human judgement. ...read more.

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