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Investigate how changing the concentration of Sodium Thiosulphate affects the rate of reaction with Hydrochloric Acid.

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Introduction

Aim: I am going to investigate how changing the concentration of Sodium Thiosulphate affects the rate of reaction with Hydrochloric Acid. I am going to time how many seconds/minutes it takes until you can no longer see the black cross on a piece of paper under the beaker. Each time I do the experiment, I will change the amount of thiosulphate and water in the reaction mixture. I want to find out if the concentrated thiosulphate makes the reaction go quicker. Background Information For a chemical reaction to take place, the particles have to collide with enough energy for something to change. There are five factors that will affect the rate of reaction that we need to take into consideration, these are: * Temperature - I will conduct all the tests at room temperature (hopefully on the same day) because temperature has an effect on the rate of the reaction. * Concentration - I will try my best to use all the acid from the same bottle, which then makes it more of a fair test as all the acid should be the same concentration. * Surface Area - This will not affect any of my results, as we are not using any solids in the investigation. * Catalyst - This speeds up reactions. ...read more.

Middle

the timing, otherwise there may be extra seconds added on to the final time of the experiment which would then not even be worth keeping and would have to be repeated. The reason I am repeating this test 3 times, is to get the most accurate results I can. The more results the better I can judge what good results to work on are and what are irregular results. Also by doing this test 3 times I can get better at doing the test and improve as I go on. Results: Test 1 How much sodium thiosulphate? Time taken for the X to disappear 4 ml Sodium Thiosulphate 6.12 min 8 ml Sodium Thiosulphate 5.43 min 12 ml Sodium Thiosulphate 3.02 min 16 ml Sodium Thiosulphate 2.29 min 20 ml Sodium Thiosulphate 1.34 min It is hard to see any irregular results in this but I think that it took too long to disappear fully. This could be because the person stopping the clock and not doing it exactly on time, or it could be down to something more scientific. I would need to do more tests to check this. Test 2 How much sodium thiosulphate? Time taken for the X to disappear 4 ml Sodium Thiosulphate 9.37 min 8 ml Sodium Thiosulphate 6.15 min 12 ml Sodium Thiosulphate 4.24 min 16 ml Sodium Thiosulphate 1.49 min 20 ml Sodium Thiosulphate 1.25 min ...read more.

Conclusion

If The Gilberd had this kind of equipment then I think it would have been a much more accurate investigation. I think that because my results have a certain amount of inconsistency between them it would be a good idea to repeat them again if I had time Are my results accurate? My results are good in their accuracy. Although, I did get some irregular results but I was expecting that. All my 'good' results fitted my prediction. I tested my results three times to make sure that I did not make any mistakes. Are they reliable? I feel that my results are accurate apart from the 'odd' one. I see them as reliable but if my views then my results are not reliable. I think I would need to look at this investigation more to make my mind up to whether they are or not. Other things that may have affected the accuracy of the experiment could include, the distance of the persons eyes away from the conical flask and the X underneath. Also before we done the test, we could of tested to see who has the best eye vision, which would therefore help a lot. To extend this work one could look into the affects of catalysts (and other variables) on reaction times or you could try the same experiment with different substances or by varying the amount of acid instead. David Mateer ...read more.

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