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To find out the effect of varying concentration of potassium iodide in a I2 / H2O2 reaction
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LAB REPORT - KINETICS Effect of Concentration (I2 / H2O2 reaction) Aim To find out the effect of varying concentration of potassium iodide in a I2 / H2O2 reaction on its reaction rate Hypothesis In this reaction between hydrogen peroxide and potassium iodide, the amount of hydrogen peroxide is kept constant while the amount of potassium iodide is changed. There are two stages that happen in this reaction. In the above reaction, hydrogen peroxide is broken down into water molecules. The iodine ions from potassium iodide are converted into iodine molecules. When sodium thiosulphate reacts with starch and uses it up, it starts reacting with iodine molecules instead, converting them back into iodine ions. Therefore the iodine ions are not used up in the reaction until all the sodium thiosulphate reacts. However, the excess iodine molecules cannot be converted back into iodide ions and react with starch instead to produce a blue colour. I predict that when...
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