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+Chemistry Coursework-How the concentration effects the rate of reaction between sodium thiosulphate and hydrochloric acid By Jess McFarlane 11WM Introduction Sodium thiosulphate and hydrochloric acid are two colourless solutions that gradually react together to form a cloudy yellow precipitate of sulphur when they are mixed. I am looking to record the rate of reaction, which is measured by dividing 1 by the time taken for the reaction to occur, (1/time taken). I have chosen to vary the concentration because it is more practical to investigate, as it would take longer to prepare if I varied the temperature of the reactants and also it is much more difficult to obtain a desired temperature of a reactant, which will produce less accurate results. The chemical equation for this experiment should look like this: HCl + sodium thiosulphate sodium chloride + sulphur dioxide + sulphur + water. 2HCl (aq) + Na2S2O3 (aq) 2NaCl (aq) + SO2 (g) +...

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