Rates - The 12 percent took 7.8 seconds. The 16 percent...

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Rates of Chemical Reactions 1. Purpose – The purpose of this lab was to analyze the change in rate due to change in concentration of reactants at room temperature. 2. Summary – We measured pipets 5 cm to define 10 drops of solution. Each experiment consisted of 50 total drops of reactants. To experiment with concentrations, the percentage of IO 3 was varied. Aqueous starch was used in order to determine when the HSO 3 was depleted. Each reaction was timed from the first drop to the end noted by the color change. The same procedure was performed at colder temperatures. 3. Summary of Data – Each variation was tested three times to find the average time. At room temperature, the 4 percent concentration of KIO 3 had an average time of 26.5 seconds to completely turn blue. The 8 percent took 12 seconds.
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Unformatted text preview: The 12 percent took 7.8 seconds. The 16 percent took 7.5 seconds. The tests performed at colder temperatures displayed the same corresponding rates vs. concentration. The standard deviation of the average observed rate constant was 0.0088. The rate law equation for this reaction is: Rate = k [IO 3-] x [HSO 3-] y [H + ] z 4. Results – We realized at colder temperatures the rate slows. The concentration vs. time had to be compared at the same temperature in order to be relevant. The same group member measured the solutions each time to keep human error at a minimum. The timekeeper was the same throughout the experiment as well. 5. Graph Rate of Reaction at room temperature y = 1.9579x - 0.1354 R 2 = 0.9913-7-6-5-4-3-2-1-3.5-3-2.5-2-1.5-1-0.5 ln(IO3)...
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This note was uploaded on 04/20/2008 for the course CHEM 115 taught by Professor March during the Spring '08 term at University of Alabama at Birmingham.

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Rates - The 12 percent took 7.8 seconds. The 16 percent...

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