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2. October. 2002 Testing the Rate of the Reaction between Na2S2O4 and HCl Introduction This experiment is test the theory that the higher the concentration of a substance the faster the rate of its reaction with another substance. In this experiment the two substances being used are sodium thiosulphate and hydrochloric acid. The equation for this reaction is: Preliminary My preliminary experiment helped me get a grasp of the overall experiment. In the preliminary I changed the concentration of the hydrochloric acid instead of the concentration of the sodium thiosulphate. The measurements I used were fifty cm cubed of sodium thiosulphate, which remained constant throughout the experiment, and then, starting at ten cm cubed of hydrochloric acid changed the volume of the hydrochloric acid. The apparatus I used was the same as list in the planning section. The experiment was done at room temperature and pressure. Here is a table of my results: Experiment Na2S2O4 HCl H2O Time Reaction rate 1 50 cm...

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