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Investigating The Rate Of Reaction Between Sodium Thiosulphate And Hydrochloric Acid

1644 words - 7 pages

Investigating the rate of reaction between Sodium Thiosulphate and Hydrochloric AcidDiagramAim : We did 4 experiments to find out how the rate of reaction changes with differing concentrations of Sodium Thiosulphate, Hydrochloric Acid and water. As an inert and stable liquid, water was used to alter concentration of Sodium Thiosulphate without changing the end amount of solution. All the atoms in a water molecule have a full outer shell, so they would not react with the other chemicals.Equipment : Beakers,Measuring cylindersClamp stand and ClampsBlack paper tubeLight probe and Blue boxDataloggerLampTotal of 30cm3 H 0, 50cm3 Na S O , 12cm3 HClMethod : We wanted to change the concentration of Sodium Thiosulphate and Hydrochloric Acid, but without changing the overall quantities. To do this, the Sodium Thiosulphate and water were mixed at different ratios, with always a constant amount of acid. The table below shows the 4 different experiments, and what each solution composed of. The 'Graph' column relates to the graphs taken from the Datalogger for that experiment, which are included at the back of this piece.Sodium Thio-sulphate (cm3) Water (cm3) Hydrochloric Acid (cm3) Graph number20 0 3 DPPAS_0215 5 3 DPPAS_0310 10 3 DPPAS_045 15 3 DPPAS_05We did not do the experiment in which 0cm3 Sodium Thiosulphate and 20cm3 water were used, as there would have been no reaction. In total, there were always 20cm3 of water and Sodium Thiosulphate, with 3cm3 Hydrochloric Acid, giving a total solution of 23cm3The black tube was put around and below the beaker to help prevent any unwanted light from entering the light probe, as this would have impaired our results.The reason we used a Datalogger and light probe instead of the old 'cross' method, is threefold. First, human error. The cross would not just disappear - it would fade. There would be no specific point at which the cross would disappear, and the results of your experiment would be based entirely on a person's eyesight. Second, this method will only tell you (albeit inaccurately) when the cross disappeared, i.e. how long it took for the reaction to get to a certain point of cloudiness. It would not tell you the varying rates of the reaction. You would not be able to tell if the reaction speeded up, slowed down, went steady all the way e.t.c. Lastly, what would you do if the reaction never got as far as making the cross disappear? Or what if the reaction took a number of hours to get that far? This traditional method is about as accurate as taking the temperature from a beaker of water with your finger.To do the experiment, we set up the apparatus as explained above. We put the various amounts of chemicals into the beaker, and used the Datalogger and blue box to record the first 3 minutes of the experiment, and then used the computer to draw up a graph. The blue box was set to SLOW and...

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