CHEM 341 Lecture Notes - Benzene, Substituent, Phenyl Group
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Table P7S2. Kinetic Study: Degradation of Drug Y in the Presence of Various Concentrations of X, Where [X] >> [Y] | |||||
[X] = 0.50 M | [X] = 0.75 M | [X] = 1.00 M | |||
Time (seconds) | Absorbance (at λ = 515 nm) | Time (seconds) | Absorbance (at λ = 515 nm) | Time (seconds) | Absorbance (at λ = 515 nm) |
0 | 1.6738 | 0 | 1.7465 | 0 | >2 |
5 | 1.5711 | 5 | 1.5170 | 5 | >2 |
10 | 1.4508 | 10 | 1.3275 | 10 | 2.1373 |
15 | 1.3478 | 15 | 1.1575 | 15 | 1.7826 |
20 | 1.2397 | 20 | 1.0087 | 20 | 1.4933 |
25 | 1.1396 | 25 | 0.8757 | 25 | 1.2562 |
30 | 1.0519 | 30 | 0.7673 | 30 | 1.0593 |
35 | 0.9653 | 35 | 0.6679 | 35 | 0.8765 |
40 | 0.8912 | 40 | 0.5883 | 40 | 0.7363 |
45 | 0.8119 | 45 | 0.5125 | 45 | 0.6207 |
50 | 0.7539 | 50 | 0.4512 | 50 | 0.5152 |
55 | 0.6895 | 55 | 0.3982 | 55 | 0.4313 |
60 | 0.6344 | 60 | 0.3481 | 60 | 0.3617 |
65 | 0.5829 | 65 | 0.3102 | 65 | 0.3051 |
70 | 0.5350 | 70 | 0.2770 | 70 | 0.2620 |
75 | 0.4911 | 75 | 0.2442 | 75 | 0.2209 |
80 | 0.4530 | 80 | 0.2199 | 80 | 0.1882 |
85 | 0.4195 | 85 | 0.1967 | 85 | 0.1566 |
90 | 0.3856 | 90 | 0.1757 | 90 | 0.1353 |
95 | 0.3581 | 95 | 0.1558 | 95 | 0.1172 |
100 | 0.3298 | 100 | 0.1415 | 100 | 0.1002 |
105 | 0.3042 | 105 | 0.1283 | 105 | 0.0888 |
110 | 0.2842 | 110 | 0.1184 | 110 | 0.0755 |
115 | 0.2621 | 115 | 0.1110 | 115 | 0.0663 |
120 | 0.2444 | 120 | 0.0994 | 120 | 0.0598 |
125 | 0.2273 | 125 | 0.0909 | 125 | 0.0515 |
130 | 0.2122 | 130 | 0.0861 | 130 | 0.0465 |
135 | 0.1987 | 135 | 0.0791 | 135 | 0.0413 |
140 | 0.1849 | 140 | 0.0744 | 140 | 0.0383 |
Data Truncation. First, select data only within the absorbance range of 1.0 to 0.1. This means, any time-absorbance pairs (A, t pairs) falling outside of this range should be excluded from the analysis. In other words, for each trial (run) use only the data that falls within the 1.0 to 0.1 absorbance range.
1. (4 p). Now using Excel, transform the remaining A entries (in the range of 1.0 to 0.1) into [Y] values (convert the absorbance into the molar concentration of Y). Perform a graphical analysis on each run to find kobs for each of the three trials (the three different concentrations of X). Present below in tabular form kobs for each [X].
2. (6 p). Plot the kobs vs. [X] recorded in the above table as ln(kobs) vs. ln[X] using Excel. Paste-in this plot below along with the linear trend-line equation and R2 value (from Excel). State the rate order n and the overall rate constant k for this system. Show all work, explaining clearly how you derived the values of n and k.