Principles of Instrumental Analysis, 6th Edition
6th Edition
ISBN: 9788131525579
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cenage Learning
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Chapter 23, Problem 23.9QAP
Interpretation Introduction
Interpretation:
The meaning of ionophore is to be stated. The purpose of ionophores in membrane electrodes should be predicted.
Concept introduction:
Membrane electrodes consists a thin glass membrane and are used to measure the pH of the solution.
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Decide whether these proposed Lewis structures are reasonable.
proposed Lewis structure
Is the proposed Lewis structure reasonable?
Yes.
:0:
Cl C C1:
0=0:
: 0 :
: 0 :
H C N
No, it has the wrong number of valence electrons.
The correct number is: ☐
No, it has the right number of valence electrons but doesn't satisfy the
octet rule.
The symbols of the problem atoms are:* ☐
Yes.
No, it has the wrong number of valence electrons.
The correct number is: ☐
No, it has the right number of valence electrons but doesn't satisfy the
octet rule.
The symbols of the problem atoms are:*
Yes.
☐
No, it has the wrong number of valence electrons.
The correct number is: ☐
No, it has the right number of valence electrons but doesn't satisfy the
octet rule.
The symbols of the problem atoms are:* |
* If two or more atoms of the same element don't satisfy the octet rule, just enter the chemical symbol as many
times as necessary. For example, if two oxygen atoms don't satisfy the octet rule, enter "0,0".
Draw the Lewis structure for the polyatomic trisulfide
anion. Be sure to include all resonance structures that satisfy the octet rule.
с
[ ] -
G
1. Calculate the accurate monoisotopic mass (using all 1H, 12C, 14N, 160 and 35CI) for your product using the table in
your lab manual. Don't include the Cl, since you should only have [M+H]*. Compare this to the value you see on
the LC-MS printout. How much different are they?
2. There are four isotopic peaks for the [M+H]* ion at m/z 240, 241, 242 and 243. For one point of extra credit,
explain what each of these is and why they are present.
3. There is a fragment ion at m/z 184. For one point of extra credit, identify this fragment and confirm by
calculating the accurate monoisotopic mass.
4. The UV spectrum is also at the bottom of your printout. For one point of extra credit, look up the UV spectrum
of bupropion on Google Images and compare to your spectrum. Do they match? Cite your source.
5. For most of you, there will be a second chromatographic peak whose m/z is 74 (to a round number). For one
point of extra credit, see if you can identify this molecule as well and confirm by…
Chapter 23 Solutions
Principles of Instrumental Analysis, 6th Edition
Ch. 23 - Prob. 23.1QAPCh. 23 - Prob. 23.2QAPCh. 23 - Prob. 23.3QAPCh. 23 - Prob. 23.4QAPCh. 23 - Prob. 23.5QAPCh. 23 - Prob. 23.6QAPCh. 23 - Prob. 23.7QAPCh. 23 - Prob. 23.8QAPCh. 23 - Prob. 23.9QAPCh. 23 - List the advantages and disadvantages of a...
Ch. 23 - Prob. 23.11QAPCh. 23 - What arc the advantages of microfabricated ISEs?...Ch. 23 - Prob. 23.13QAPCh. 23 - Prob. 23.14QAPCh. 23 - Prob. 23.15QAPCh. 23 - The following cell was used for the determination...Ch. 23 - The following cell was used to determine the pSO4...Ch. 23 - The formation constant for the mercury(II) acetate...Ch. 23 - Prob. 23.19QAPCh. 23 - The cell Ag|AgCl(sat’d)||H+(a = x)|glass electrode...Ch. 23 - The following cell was found to have a potential...Ch. 23 - The following cell was found to have a potential...Ch. 23 - The following cell was found to have a potential...Ch. 23 - Prob. 23.24QAPCh. 23 - Prob. 23.25QAPCh. 23 - Prob. 23.26QAPCh. 23 - Prob. 23.27QAP
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