Kinetics_of_a_reaction - Christina Wong AP Chemistry 4th...

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Christina Wong AP Chemistry, 4 th Hour 1/13/2010 Kinetics Lab I. Purpose The purpose of this experiment was to investigate how the rate of a reaction can be measured and how reaction conditions affect reaction rates. By varying the concentration of each reactant individually the order for each can be found. Then, the rate constant can be calculated with the order known. Also, the activation energy for the reaction can be determined by repeating the experiment at different temperatures. The rate law was experimentally determined to be rate = k [I ][BrO 3 ][H + ] 2 . II. Procedure Part 1 - We began by obtaining a microtip Beral-type pipet and filling it with 3 mL of distilled water. We massed a small beaker with a balance, and then used a pipet to deliver five drops of water into the beaker, and then measured that total mass. We added an additional five drops of water into the beaker and determined that mass, and then added another five more drops, determining the mass once more. To best determine the average mass of one drop of water, we found the average mass of a drop of water in each of these three trials, and then took the average of these averages. Part 2 - We then took six microtip pipets and filled them with 2 mL each of KI, H 2 O, HCl, starch, Na 2 S 2 O 3 , and KBrO 3 . We then took a well plate, and then performed seven different experiments, by making a twelve drop mixture with different quantities of each solution, and then recording the time that it took for each of the mixtures to react. We were able to determine when a mixture had reacted when the color changed. We also took the temperature of one of the reaction solutions and assumed this temperature constant. Part 3 - Afterwards, we prepared a shallow warm water bath of about 40 °C, and filled the six wells in our reaction strip with the given number of drops from the previous experiment. After that we placed our Beral pipet in the bath and
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filled it half-full with 0.040 M KBrO 3 solution. Five minutes later we recorded the temperature of the water, took the pipet out of the water, and with the reaction strip still in the bath, added two drops of KBrO3 solution to the first well, stirred, and started our timer. We recorded the time it took for the first blue color to appear, and then repeated this process for the other two wells. We then used ice cubes and water to create a cold temperature bath, and placed both the reaction strip and Beral-type pipet into the cold bath, measured the temperature, and repeated the previous steps to measure the time it took for our last three solutions to react in the cold bath. Part 4 - Finally, we repeated the procedure for finding the rate order of KI for only the first experiment, but added one drop of 0.1 M copper(II) nitrate solution, and only three drops of distilled water to the mixture. We filled only the first reaction wells, and then recorded these reaction times. We timed to when the solution first turns blue after the drop of KBrO
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This note was uploaded on 12/03/2011 for the course CHEM BIO P 101 taught by Professor Kk during the Spring '11 term at Rochester.

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Kinetics_of_a_reaction - Christina Wong AP Chemistry 4th...

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