Quantitative Chemical Analysis
9th Edition
ISBN: 9781464135385
Author: Daniel C. Harris
Publisher: W. H. Freeman
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Question
Chapter 24, Problem 24.5P
a)
Interpretation Introduction
Interpretation:
The advantages and disadvantages of temperature programming in gas chromatography has to be given.
Concept Introduction:
Time and Pressure programming in Gas chromatography:
Temperature programming is used to run a large fraction of all gas chromatography. In this the temperature of the column is increased during the separation to raise the vapour pressure of the analyte and reduce the retention time of late-eluting components.
For some cases, program temperature can be replaced with program pressure to decrease the retention times of late-eluting components. The pressure can be immediately reduced to its initial value for the run. Those analytes that cannot withstand high temperature can be run with the help of programmed pressure.
To explain the advantage and disadvantage of temperature programming in gas chromatography
b)
Interpretation Introduction
Interpretation:
The advantage of pressure programming in gas chromatography has to be given.
Concept Introduction:
Time and Pressure programming in Gas chromatography:
Temperature programming is used to run a large fraction of all gas chromatography. In this the temperature of the column is increased during the separation to raise the vapour pressure of the analyte and reduce the retention time of late-eluting components.
For some cases, program temperature can be replaced with program pressure to decrease the retention times of late-eluting components. The pressure can be immediately reduced to its initial value for the run. Those analytes that cannot withstand high temperature can be run with the help of programmed pressure.
To explain the advantage of pressure programming in gas chromatography
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Using reaction free energy to predict equilibrium composition
Consider the following equilibrium:
2NOCI (g) 2NO (g) + Cl2 (g) AGº =41. kJ
Now suppose a reaction vessel is filled with 4.50 atm of nitrosyl chloride (NOCI) and 6.38 atm of chlorine (C12) at 212. °C. Answer the following questions
about this system:
?
rise
Under these conditions, will the pressure of NOCI tend to rise or fall?
x10
fall
Is it possible to reverse this tendency by adding NO?
In other words, if you said the pressure of NOCI will tend to rise, can that
be changed to a tendency to fall by adding NO? Similarly, if you said the
pressure of NOCI will tend to fall, can that be changed to a tendency to
rise by adding NO?
yes
no
If you said the tendency can be reversed in the second question, calculate
the minimum pressure of NO needed to reverse it.
Round your answer to 2 significant digits.
0.035 atm
✓
G
00.
18
Ar
Highlight each glycosidic bond in the molecule below. Then answer the questions in the table under the drawing area.
HO-
HO-
-0
OH
OH
HO
NG
HO-
HO-
OH
OH
OH
OH
NG
OH
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+
Suppose the molecule in the drawing area below were reacted with H₂ over a platinum catalyst. Edit the molecule to show what would happen to it. That is, turn
it into the product of the reaction.
Also, write the name of the product molecule under the drawing area.
Name: ☐
H
C=0
X
H-
OH
HO-
H
HO-
-H
CH₂OH
×
Chapter 24 Solutions
Quantitative Chemical Analysis
Ch. 24.1 - Prob. 1TYCh. 24 - Prob. 24.AECh. 24 - Prob. 24.BECh. 24 - Prob. 24.CECh. 24 - Prob. 24.DECh. 24 - Prob. 24.EECh. 24 - Prob. 24.1PCh. 24 - Prob. 24.2PCh. 24 - Prob. 24.3PCh. 24 - Prob. 24.4P
Ch. 24 - Prob. 24.5PCh. 24 - Prob. 24.6PCh. 24 - Prob. 24.7PCh. 24 - Prob. 24.8PCh. 24 - Prob. 24.9PCh. 24 - Prob. 24.10PCh. 24 - Prob. 24.11PCh. 24 - Prob. 24.12PCh. 24 - Prob. 24.13PCh. 24 - Prob. 24.14PCh. 24 - Prob. 24.15PCh. 24 - Prob. 24.16PCh. 24 - Prob. 24.17PCh. 24 - Prob. 24.18PCh. 24 - Prob. 24.19PCh. 24 - Prob. 24.20PCh. 24 - Prob. 24.21PCh. 24 - Prob. 24.24PCh. 24 - Prob. 24.25PCh. 24 - Prob. 24.26PCh. 24 - Prob. 24.27PCh. 24 - Prob. 24.28PCh. 24 - Prob. 24.29PCh. 24 - Prob. 24.30PCh. 24 - Prob. 24.31PCh. 24 - Prob. 24.32PCh. 24 - Prob. 24.33PCh. 24 - Prob. 24.34PCh. 24 - Prob. 24.35PCh. 24 - Prob. 24.36PCh. 24 - Prob. 24.37P
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