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Investigate the rates of reaction of Sulphur Dioxide and Iodate solutions

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Introduction

Guy Burton 11AS Chemistry Coursework October 2003 Investigate the rates of reaction of Sulphur Dioxide and ___ _ Iodate solutions Planning_______________________________________ ___ Clock reactions are chemical reactions which happen a certain amount of time after two chemicals have been mixed. The way in which my experiment works is... In my experiment I am investigating the effect on varying the amount of each of the two chemicals, Iodate and Sulphur Dioxide, compared to the time elapsed between adding the two chemicals together and the reaction taking place. To keep the experiment as a fair test, the total volume of both reactants must be the same each time. ...read more.

Middle

Briefly stir the solution 5) Stop the stopwatch when the clock reaction takes place. I predict that both reactants will behave in the same way when their volume is decreased in the solution. i.e the time taken for the reaction will be the same if there is 15ml of SO2, 20ml of Iodate and 5 ml of water as if there was 20ml of SO2, 15ml of Iodate and 5ml of water. This is because; from my preliminary experiments I found out that neither solution is more important than the other, and equal proportions of SO2 and Iodate takes the shortest time to react. From this, I also predict that the smaller the ratio of SO2 to Iodate, or Iodate to SO2, the longer the clock reaction will take to happen. ...read more.

Conclusion

12.88 10.32 12.81 12.00 1.46 1.00 0.08 SO2 Iodate Water Time Time 2 Time 3 Average S.D Concentration Rate 20.00 20.00 0.00 12.88 10.32 12.81 12.00 1.46 1.00 0.08 20.00 15.00 5.00 21.02 19.16 21.59 20.59 1.27 0.75 0.05 20.00 10.00 10.00 42.93 42.29 40.32 41.85 1.36 0.50 0.02 20.00 5.00 15.00 42.43 53.54 51.23 49.07 5.86 0.25 0.02 Analysis ________________________________________ Because there are two variables which I controlled, I have plotted three graphs, one for when I used 20ml of Sulphur dioxide and decreased the amount of Iodate, one for when I used 20ml of Iodate and one rate over concentration graph which allows me to compare the two sets of results. This final graph uses the averages of the two sets of data. ...read more.

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