Analysing; The Reaction of Hydrogen Peroxide and Iodide ions

... Skill 3: Analysing; The Reaction of Hydrogen Peroxide and Iodide ions Table of Results Experiment Volume of KI used (dm3) Volume of water used (dm3) Concentration of I- ions Time taken for colour to appear (S) A 5.0 x 10-3 0.020 0.02 9:56 B 0.010 0.015 0.04 5:36 C 0.015 0.010 0.06 4:07 D 0.020 5.0 x 10-3 0.08 3:27 E 0.025 0.000 0.1 2:40 We calculate the concentration of I- ions by following these stages (taking the hypothetical value of experiment A) Number of moles of KI contained = volume x concentration = 5.0 x 10-3 x 0.1 = 5.0 x 10-4 moles = Number of I- ions contained in the solution Concentration of solution = number of mols Volume of solvent = 5.0 x 10-4 / (25/1000) = 0.02 mol/dm3 Thus I have calculated the other values, which appear on the table Analysis Derived from the rate equation Log (1/time) = n log (volume of KI) + constant We can calculate the rate of reaction, by determining first, n, which can be obtained by calculating the gradient of the line on the following page. Nevertheless, we would need to convert most of the

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