Lab Report 17

Lab Report 17 - reagent This error would cause the reaction...

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Determining a Rate Law and Rate Constant (Lab #17) Jesse LaSalle TA: Guang Li Experiment Completed: February 12, 2008 Report Submitted: February 19, 2008
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I) Purpose : To determine the rate constant and law for a reaction. II) Procedure : Casey, J. and R. Tatz (2008). Determining a Rate Law and Rate Constant. General Chemistry Laboratory Experiments , Hayden McNeil. Vol.2: 65-67. III) Data : (See attached report forms.) IV) Calculations : [CrEDTA - ] f , Solution 1 CrEDTA - = = f Absorbanceslope of beer'slaw graph Am CrEDTA - = . f 0 . = . 772227 2 0 00340 M [CrEDTA - ] t , Solution 4, at t=0 CrEDTA - = = t Absorbanceslope of Beer'sLaw Graph Am CrEDTA - = . . = t 0 052227 2 0.000229M [Cr 3+ ]t, Solution 4, at t=0 Cr + = + - - 3 t Cr 3 0 CrEDTA t Cr + = . - . = 3 t 0 004 0 000229 0.003771M V) Error analysis/Conclusion: There were very few possible sources for error in this laboratory experiment. When initially mixing the solutions it is possible that one could use an incorrect amount of either
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Unformatted text preview: reagent. This error would cause the reaction rate to be calculated incorrectly as the reaction would not happen at the rate accepted. This lab introduced students to the concepts of spectrophotometers and determining rate laws and constants. Both of these are important to the concepts learned in class. The graph of [Cr 3+ ] t Vs t was the nearest to a straight line, therefore the rate law was of the zero order. The average value of k was 2.25x10-5 7.5x10-6 . These two calculated values allow a rate law of rate = 2.25x10-5 [Cr 3+ ] 1 . VI) Questions: 1. a. = .- [ +] rate 2 25x10 5 Cr3 = .- . = . -rate 2 25x10 5 0028 6 3 x 10 8 b.-c. = .-. = .-rate 2 25x10 50 0056 1 26x10 7 2. / = ] =. .- = t1 2 A 02k 00332x2 25x10 5 74 seconds 3. 4. 5....
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This lab report was uploaded on 02/25/2008 for the course CHEM 122 taught by Professor Zellmer during the Winter '07 term at Ohio State.

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Lab Report 17 - reagent This error would cause the reaction...

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