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How does concentration affect reaction rate?

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How does concentration affect reaction rate? Introduction I will be carrying out an investigation into how concentration affects reaction rate. I will be looking at sodium thiosulphate and hydrochloric acid. The reaction is represented by the following equation: Na2S2O3(aq) + 2HCl(aq) 2NaCl(aq) + H2O(l) + SO2 (g) + S (s) I will add the hydrochloric acid to the Sodium Thiosulphate and time how log it takes for the mixture to turn opaque. I will use a different concentration of Sodium Thiosulphate each time. Prediction My predictions, using previous knowledge is that the higher the concentration of Sodium Thiosulphate there is the faster the reaction rate will be. ...read more.


1) The number of collision per unit time between the reacting species. 2) The fraction of these collisions that are successful in producing a mew molecule. If two or more molecules collide but are not orientated correctly then no reaction will take place. For a reaction to occur, molecules must collide not only with sufficient energy but with the proper orientation. This diagram is the reaction between ethane, CH2CH2, and hydrogen chloride, HCl. In dilute Sodium Thiosulphate there are not so many particles. This means that the chance of the particles colliding, and colliding correctly is much less than if the Sodium Thiosulphate was concentrated. ...read more.


When the mixture has turned sufficiently cloudy so that the letter X can no longer be seen the stopwatch will be stopped and the time will be recorded. The experiment is repeated with the concentrations of Sodium Thiosulphate and distilled water are changed. The whole procedure is then repeated. The experiment is repeated until a wide range of results are obtained. A graph can then be drawn representing the results. Fair Test In order for my findings to be valid the experiment must be a fair one. I will use the same standard each time for judging when the X has disappeared. I will make sure that the measuring cylinders for the HCl and sodium thiosulphate will not be mixed up. The amount of HCl will be 5 cm3 each time. ...read more.

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