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Investigating Rates of Reaction.

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Katie Sutton Chemistry Coursework Investigating Rates of Reaction (suspension) Sodium + Hydrochloric Sodium + Sulphur + Water + Sulphur Thiosulphate Acid Chloride Dioxide Na2S2O3 + 2HCl NaCl + SO2 + H2O + S (aq) (aq) (aq) (g) (l) (s) I am going to investigate the effect of temperature on the rate of a chemical reaction, between Sodium Thiosulphate and Hydrochloric Acid. I am going to follow the course of the reaction by drawing a cross on a sheet of paper and placing the beaker containing the reaction over it, I will wait and time with a stop watch until the (sulphur) solid is thick enough to obliterate the cross on the paper in a 'cloudy' liquid. ...read more.


I am going to keep the concentration, volume, use the same cross each time and have the same person say when the cross has been obliterated, this is to ensure that the experiment is a fair and unbiased as possible. Keeping the concentration and volume is important because if different concentrations are used the higher or lower the concentration will cause the experiment to be fair, the same rule for volume. I must use the same cross and person each time because everyone has a different degree of eyesight and if the cross is a different colour/size that person may find different colours and sizes easier to see than others. ...read more.


I did this experiment 8 times keeping everything the same except for the temperature with was risen each time by 4 C. this was accomplished by putting the beaker containing the chemicals into a larger beaker of water. The desired temperature, which was achieved by leaving kettle water to cool until the certain temperature was achieved. Katie Sutton Chemistry Coursework Investigating Rates of Reaction Conclusion My prediction was correct, the higher the temperature, the faster the reaction. This was because when the Sodium Thiosulphate is heated, the particles move around faster, increasing the likelihood of successful collisions. When the Thiosulphate particles collide with the Hydrochloric Acid, energy is passed on causing them to react. The higher the temperature of the particles the more energy in them. This explains the results on my graph, which apart from a few ...read more.

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