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Using the iodine clock method to find the order of a reaction.
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| Submitted: Thu Jul 11 2002
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Using the iodine clock method to find the order of a reaction. Requirements: * 0-110 thermometer * boiling tubes (5) * test-tubes * burettes (or graduated pipettes 1cm , 2cm and 5cm ) * potassium iodide solution, 1.00 mol dm (15cm ) * potassium peroxodisulphate(VI) (K S O ) solution, 0.0400 mol dm (10cm ) * sodium thiosulphate (Na S O ) solution, 0.0100 mol dm (10cm ) * freshly made starch solution (5cm ) * stopwatch Introduction: This reaction takes place when peroxodisulphate(VI) ions and iodide ions react together in solution to form sulphate(VI) ions and iodine. Here is a clear view of the balanced equation representing this reaction; S O (aq) + 2I (aq) - 2SO (aq) + I (aq) Measuring the reaction can be done by following the colour of the iodine produced. This is the reason for the starch solution, as iodine forms an intense blue-black presence once they come together. You can make the time taken to produce a...
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