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This investigation will be executed to see how varying the concentration of sodium thiosulphate will effect the time taken for a reaction to occur with hydrochloric acid. Prediction The higher the concentration of sodium thiosulphate, the faster the reaction. The chemical reaction that is taking place is as follows: Sodium Thiosulphate + Hydrochloric acid › Sodium Chloride + Water + Sulphur dioxide + Sulphur Na2S2O3 (aq) + 2HCl (aq) › 2NaCl (aq) + H2O (l) + SO2 (g) + S (s) The reactant will react when 2 particles collide. This theory is called "collision theory". Collision theory states that as the concentration of reactants increases, so does the rate of reaction. In higher concentration solutions, there are more particle collisions; this will increase probability of a reaction taking place, and the higher the concentration - the faster the reaction will occur. The method being used to investigate the reaction rates involves making various concentrations of sodium thiosulphate...

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