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Do an experiment to see how concentration affects the rate of a reaction.

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Irana Tarling Chemistry Coursework Na S O (aq) + 2HCl(aq) 2NaCl(aq) + SO (g) + H O(l) + S(s) Sodium + Hydrochloric Sodium + Sulphur + water + sulphur Thiosulphate acid chloride dioxide I am going to do an experiment to see how concentration affects the rate of a reaction. From past experiments I think that the higher the concentration, the faster the reaction will be. There are many different factors that could also speed up a reaction such as: surface area Temperature Catalysts And concentration. I have chosen to change the concentration because you can control it better than the others, and it is very clear to see what has been affected. I also think that I will get the most noticeable differences between each experiment. ...read more.


I will measure the sodium thiosulphate and hydrochloric acid in different measurement cylinders to make sure that it is accurate and they haven't already been mixed, as this would make the reaction start early. The temperature will be room temperature and as much the same heat as possible, as the hotter it is the faster the reaction will happen, so if there is a great change in temperature the experiment will be affected. I will vary the concentration by adding water to the sodium thiosulphate, and putting less thiosulphate in. I will use distilled water, as this has no minerals in, and normal tap water might, which might influence the speed of the reaction. I will time the rate of reaction by watching to see when the cross has disappeared because it is the most accurate. ...read more.


You can see this on the graph. I could have made my results more accurate by using a burnet to measure the liquids, and keeping the temperature exactly the same - which I could not do because the experiments were done in a classroom on different days. I made sure the conical flasks were the same size. It would have been a good idea to use ICT to plot the graph, if I had used a light sensitive censor, as this would have made it much more accurate. I should also have used a digital clock, as this would have given me a more accurate reading, to the exact time. I think the experiments worked out well, as I got clear, accurate results. The graphs were quite a smooth curve, and I got the results I had expected. I think that I should have repeated the experiment again to make sure that the results were correct, as this would have made the average more accurate. ...read more.

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