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To measure the rate of reaction of thiosulphate ions with acid in solution, and find out how the rate of reaction depends on the concentration of both thiosulphate and acid.
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Chemistry - CH2 Practical Assessment Written Account of Practical Assessment Aim: To measure the rate of reaction of thiosulphate ions with acid in solution, and find out how the rate of reaction depends on the concentration of both thiosulphate and acid. Hypothesis & Prediction: We will place the reaction vessel over a black cross, drawn on a white background. The black cross will disappear from view, owing to the increased sulphur concentration in the solution, when a fixed amount of reaction has taken place. I predict that the time taken for this fixed amount of reaction is directly proportional to the rate of reaction; that is, if the reaction is fast, the cross will disappear quickly and vice versa. The more concentrated the reagents, therefore, the faster the reaction will be. Background Information & Knowledge: Reactions can only happen when the reactant particles collide, but most collisions are not successful in forming product molecules. The...
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