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Aim: The aim of this experiment is to find out how the rate of reaction changes when we change the concentration of Sodium Thiosulphate solution and water. Prediction: I predict that as the concentration level is increased, the time taken for a reaction to take place will increase. Fair Test: The other factors that can be changed are the temperature, catalyst, surface area and the concentration. I will make this a fair test by repeating hydrochloric acid the same. Results will be recorded by using a table and graph. Factors Affecting The "Rate Of Reaction". The Effect Of Concentration If the concentration of any reactant in a solution is increased, the rate of reaction is increased o Increasing the concentration, increases the probability of a collision between reactant particles because there are more of them in the same volume and so increases the chance of a fruitful collision forming products. o e.g. Increasing the concentration of acid...

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