EBK GET READY FOR ORGANIC CHEMISTRY
2nd Edition
ISBN: 9780321830555
Author: KARTY
Publisher: VST
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Chapter 3, Problem 3.7P
Interpretation Introduction
Interpretation:
The orbital interaction that would be necessary to generate each sp hybrid orbital from pure AOs is to be drawn by considering the given pair of sp hybrid orbitals.
Concept introduction:
Any sp-hybridized atom has two sp hybrid orbitals and two unhybridized p orbitals. The two sp hybrid orbitals are aligned along the same axis and point in opposite directions. Mixing of the lobe with the same phase leads to constructive interference, thus increasing the size of the lobe. The other lobe of p orbital having an opposite phase as s orbital leads to destructive interference on that side. The size of the lobe on this side is smaller than the other lobe. The larger lobe shows the overlapping of s and p orbitals with the same phase. The smaller lobe is often omitted entirely for simplicity.
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On the next page is an LC separation of the parabens found in baby wash. Parabens are
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a. In the chromatogram, estimate k' for ethyl paraben. Clearly indicate what values you used for
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b. Is this a "good" value for a capacity factor? Explain.
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MAU
| Methyl paraben
40
20
0
-2
Ethyl paraben n-Propyl paraben
n-Butyl paraben
App ID 22925
6
8
min
d. In Figure 4, each stationary phase shows some negative correlation between plate count
and retention factor. In other words, as k' increases, N decreases. Explain this relationship
between k' and N.
Plate Count (N)
4000
3500
2500
2000
1500
1000
Figure 4. Column efficiency (N) vs retention factor (k') for 22
nonionizable solutes on FMS (red), PGC (black), and COZ (green). 3000
Eluent compositions (acetonitrile/water, A/W) were adjusted to obtain
k' less than 15, which was achieved for most solutes as follows: FMS
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columns were 50 mm × 4.6 mm id and packed with 5 um particles,
except for COZ, which was packed with 3 um particles. All other
chromatographic conditions were constant: column length 5 cm,
column j.§. 4.6 mm, flow rate 2 mL/min, column temperature 40 °C,
and injection volume 0.5 μL
Log(k'x/K'ethylbenzene)
FMS
1.5
1.0
0.5
0.0
ཐྭ ཋ ཤྩ བྷྲ ;
500
0
5
10…
f. Predict how the van Deemter curve in Figure 7
would change if the temperature were raised
from 40 °C to 55 °C.
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volume 0.5 and column temperature 40 °C. No corrections to the
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Reduced Plate Height (h)
°
20
40
60
Reduced Velocity (v)
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obtained:
Ppb benzene
Peak area benzene
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10.0
252
376
Sample
533
368
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Chapter 3 Solutions
EBK GET READY FOR ORGANIC CHEMISTRY
Ch. 3 - Prob. 3.1PCh. 3 - Prob. 3.2PCh. 3 - Prob. 3.3PCh. 3 - Prob. 3.4PCh. 3 - Prob. 3.5PCh. 3 - Prob. 3.6PCh. 3 - Prob. 3.7PCh. 3 - Prob. 3.8PCh. 3 - Prob. 3.9PCh. 3 - Prob. 3.10P
Ch. 3 - Prob. 3.11PCh. 3 - Prob. 3.12PCh. 3 - Prob. 3.13PCh. 3 - Prob. 3.14PCh. 3 - Prob. 3.15PCh. 3 - Prob. 3.16PCh. 3 - Prob. 3.17PCh. 3 - Prob. 3.18PCh. 3 - Prob. 3.19PCh. 3 - Prob. 3.20PCh. 3 - Prob. 3.21PCh. 3 - Prob. 3.22PCh. 3 - Prob. 3.23PCh. 3 - Prob. 3.24PCh. 3 - Prob. 3.25PCh. 3 - Prob. 3.26PCh. 3 - Prob. 3.27PCh. 3 - Prob. 3.28PCh. 3 - Prob. 3.29PCh. 3 - Prob. 3.30PCh. 3 - Prob. 3.31PCh. 3 - Prob. 3.32PCh. 3 - Prob. 3.33PCh. 3 - Prob. 3.34PCh. 3 - Prob. 3.35PCh. 3 - Prob. 3.36PCh. 3 - Prob. 3.37PCh. 3 - Prob. 3.38PCh. 3 - Prob. 3.39PCh. 3 - Prob. 3.40PCh. 3 - Prob. 3.41PCh. 3 - Prob. 3.42PCh. 3 - Prob. 3.43PCh. 3 - Prob. 3.44PCh. 3 - Prob. 3.45PCh. 3 - Prob. 3.46PCh. 3 - Prob. 3.47PCh. 3 - Prob. 3.48PCh. 3 - Prob. 3.49PCh. 3 - Prob. 3.50PCh. 3 - Prob. 3.51PCh. 3 - Prob. 3.52PCh. 3 - Prob. 3.53PCh. 3 - Prob. 3.54PCh. 3 - Prob. 3.55PCh. 3 - Prob. 3.56PCh. 3 - Prob. 3.1YTCh. 3 - Prob. 3.2YTCh. 3 - Prob. 3.3YTCh. 3 - Prob. 3.4YTCh. 3 - Prob. 3.5YTCh. 3 - Prob. 3.6YTCh. 3 - Prob. 3.7YTCh. 3 - Prob. 3.8YTCh. 3 - Prob. 3.9YTCh. 3 - Prob. 3.10YTCh. 3 - Prob. 3.11YTCh. 3 - Prob. 3.12YTCh. 3 - Prob. 3.13YT
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