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THE REACTION OF HYDROGEN PEROXIDE AND IODIDE IONS
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THE REACTION OF HYDROGEN PEROXIDE AND IODIDE IONS I have performed an experiment in order to find out the time it takes to produce iodine, by reacting Hydrogen peroxide with iodide ions. As the iodine is produced it reacts with the thiosulphate and then is converted back to iodide ions. Once all the thiosulphate ions are used up the solution changes to a blue/black colour as the iodine molecules react with the starch. The amount of potassium iodide and the water are varied but the Sodium Thiosulphate and the starch remain a fixed amount. I have carried out the 5 experiments and recorded my results on a separate table. I have repeated experiment C as I had an anomalous result. MAXIMUM ERRORS OF APPARATUS Maximum error of 50cm3 burette = 0.15/50x100 = 0.3% Maximum error of 10cm3 pipette = 0.10/10x100 = 1% Maximum error of 25cm3 measuring cylinder = 0.50/25x100 = 2% The overall percentage apparatus error is = 4.3% SOURCES...
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