Lab7_results - M ichael Butler 7/14/10 Experiment 7:...

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Michael Butler 7/14/10 Experiment 7: Investigation of the Interaction of a Lewis Acid With a Lewis Base Michael Butler Georgia Tech Honor Challenge I commit to uphold the ideals of honor and integrity by refusing to betray the trust bestowed upon me as a member of the Georgia Tech community. Date Submitted: 7/14/10 Lab Partner: Shivani Shah Lab Section/TA: 1312 A2/Lisa Vaughan
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Michael Butler 7/14/10 STUDENT NOTES PRE-lab: you do not have to answer the inductive or resonance effect question-but do think about it. All these base’s ‘R’ groups except one, affect the basic nitrogen’s ability to donate through their sigma bonds to the ring so they are all inductive effects. Which base do you think has a resonance effect on the ring N’s electron density. bases pK b Kb Inductive or  Resonance Effect? Electron donating  or withdrawing? Pyridine 8.75 1.78E-09 N/A 2- methylpyridine 8.06 8.71E-09 Donating 3- methylpyridine 8.32 4.79E-09 Donating 4- methylpyridine 7.98 1.05E-08 Donating 3-chloropyridine 11.16 6.92E-12 Withdrawing 4-aminopyridine 4.83 1.48E-05 Donating 3,5- dimethylpyridine 7.86 1.38E-08 Donating 2,4- dimethylpyridine 7.01 9.77E-08 Donating POST-LAB Title/Cover- 5pts Data/Results- 50 pts DATA- 4pts Base added, ul 3- Chloro py Pyridi ne, py 3 methyl py 2 methyl py 4 methyl py 3,5- dimethyl py 2,4- dimethyl py 4-amino py 0 1.093 1.113 1.096 1.121 1.055 1.086 1.146 0.944 10 1.014 1.018 0.985 1.090 1.000 0.979 1.127 0.979 20 1.010 0.895 0.801 1.050 0.947 0.944 1.117 0.936 30 0.965 0.797 0.663 1.087 0.889 0.943 1.068 0.834 40 0.951 0.691 0.596 1.058 0.881 0.866 1.038 0.808 50 0.922 0.666 0.556 1.075 0.804 0.812 0.999 0.734
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Michael Butler 7/14/10 60 0.875 0.634 0.545 1.049 0.722 0.780 0.970 0.658 70 0.874 0.604 0.545 0.986 0.757 0.765 0.968 0.647 80 0.850 0.610 0.499 1.028 0.775 0.729 0.952 0.618 90 0.839 0.597 0.496 0.977 0.760 0.720 0.919 0.574 100 0.831 0.571 0.482 0.922 0.739 0.701 0.899 0.543 K b 6.92E -12 1.78 E-09 4.79E -09 8.71E- 09 1.05E -08 1.38E- 08 9.77E- 08 1.48E- 05 pK b 11.16 8.75 8.32 8.06 7.98 7.86 7.01 4.83 You will need to plot out all 8 ligands. This is best done in Excel. For this report, you may enter your data in Excel and print out the Excel as part of your data/results. You should use EXCEL (not a calculator) to calculate the base concentration and the X-axis. You have too many plots to make and you should be using Excel to do formulas now all the time. RESULTS-8 plots: each plot and data table is 5pts x 8 = 40 pts Ligand Concentration 0.0526 3-Chloropyridine [Zn-TPP] 5.00E- 05 Ao 1.093 Volume Added (μL) [Base] Aobs (Ao-Aobs)/ [Base] 10 2.62E-04 1.014 3.02E+02 20 5.21E-04 1.010 1.59E+02 30 7.77E-04 0.965 1.65E+02 40 1.03E-03 0.951 1.38E+02 50 1.28E-03 0.922 1.33E+02 60 1.53E-03 0.875 1.42E+02 70 1.78E-03 0.874 1.23E+02 80 2.02E-03 0.850 1.20E+02 90 2.27E-03 0.839 1.12E+02 100 2.50E-03 0.831 1.05E+02 Slope (positive) 1/Slope 9.00E-04 1111.1
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Michael Butler 7/14/10
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This note was uploaded on 10/21/2010 for the course CHEMISTRY 1312 taught by Professor Bottomley during the Summer '10 term at Georgia Tech.

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Lab7_results - M ichael Butler 7/14/10 Experiment 7:...

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