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Chemistry Coursework Introduction I will be conducting an experiment on the rate of reaction for my GCSE coursework. I will be doing this coursework for a period of two weeks. We will be reacting sodium thiosulphate with hydrochloric acid. I will be investigating the effect of different concentration on the reaction rate. When sodium thiosulphate and hydrochloric are mixed, a yellow precipitate of sulphur is produced. Hypothesis I predict that the more concentrated each variable is in the mixture, the less time it will take for the cross to disappear under the conical flask. Therefore the more dilute the mixture is the longer the cross will take to disappear. Background Information * The rate of a reaction is the speed at which a reaction happens. If a reaction has a low rate, then that means the molecules combine at a slower speed than a reaction with a high rate. Some reactions take hundreds, maybe even thousands...

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