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I am going to investigate the effect of varying the concentration of Sodium Thiosulphate solution in a reaction with Hydrochloric Acid. The theory behind this experiment is that 'Increasing the concentration can increase the rate of the reaction by increasing the rate of molecular collisions.' I chose this reaction because it has a definite end point (when the cross disappears on the paper). The equation for the reaction is: Sodium Thiosulphate + Hydrochloric Acid È Sodium Chloride + Water + Sulphur + Sulphur dioxide Or Na S O (aq) + 2HCL (aq) È 2 Na Cl (aq) + H O (l) + S (s) + SO (g) Plan Equipment · 2 Measuring cylinders · Conical flask · Beaker · Stopwatch · Paper with cross marked on it · Sodium Thiosulphate solution · Hydrochloric Acid · Water · Pipette Prediction I predict that the greater the concentration of Sodium Thiosulphate solution the faster the chemical reaction will take place. Therefore, the...

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