effect of concentration on reaction rate
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Introduction
We are doing an investigation on the speed of reaction. When sodium thiosulphate solution reacts with acid, a precipitate of sulphur forms. The time taken for a certain amount of sulphur to form can be used to indicate the rate of the reaction. In this experiment the effect of the concentration of sodium thiosulphate on the rate of this reaction is investigated. We will have 50cm of sodium thiosulphate solution in a flask, 0cm of water and 5cm of dilute hydrochloric acid in a small cylinder. We then put the hydrochloric acid in the sodium thiosulphate and straight away we start the stop watch. We stop the time when the mixture goes completely milky where we can't see the cross on the bottom of the flask. That's the first result. The second result will need to have 40cm of sodium thiosulphate, 10cm of water and the same amount of hydrochloric acid (the same amount every time). And for every next result, we take out 10cm of sodium thiosulphate and add 10cm of water each time...