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Word Count: 505
The rate of a chemical reaction is the derivative of the extent of the reaction with respect to time to measure the effect of concentration upon the rate of the reaction of peroxydisulfate ion with iodine ion to determine the order of the reaction with respect to the reactant concentrations and to obtain the rate law for the chemical reactionFour reaction solutions are prepare as1-Dilute 5 mL of 02 M KI solution with 10 mL of distilled water in a test tube add 3 drops of starch solution and mix thoroughly and then add 5 mL of 02 M NH4S2O8 solution Mix Wait a while and observe color changes2-Repeat the procedure in 1 but when the solution changes color add 4 drops of 04 M Na2S2O3 mix the solution and note the effect that the addition of Na2S2O3 has on the colorPrepare solution 1 in a 250-mL Erlenmeyer flask that has been scrupulously cleaned and dried Pipet 250 mL of NH42S2O8 solution into a clean dry 100-mL beaker Be ready to begin timing the reaction when the solutions are mixed The reaction starts the moment the solutions are mixed Be prepare ZERO TIME Quickly pour the 250mL of NH42S2O8 solution into solution 1 and swirl vigorously note the time you begine mixing to the nearest second At the instant when the blue black color appears 2 x10-4 mole of S2O8 -4 has reacted IMMEDIATELY be prepare add a 1-mL aliquot of Na2S2O3 solution from the pipet and swirl the solution the color will disappearRecord the time for the reappearance of the blue black color Add an other 1 mL aliquot of Na2S2O3 solution and note the time for the reappearance of the color The time interval being measured is that between the appearance of the black color For good results these aliquots of Na2S2O3 must measured as quickly accurately and reproducibly as possible Continue this procedure until you have added seven
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