Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
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Chapter 26, Problem 26.8QAP
Interpretation Introduction
Interpretation:
The method of determining the number of plates in a column is to be stated.
Concept introduction:
The width of the peak of the solute and the retention time of a peak of the solute on a chromatogram are used to calculate the number of the plates given for a solute on a chromatogram.
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Relative Transmittance
0.995
0.99
0.985
0.98
Please draw the structure that is consistent with all the spectral data below in the box and
alphabetically label the equivalent protons in the structure (Ha, Hb, Hc ....) in order to assign all the
proton NMR peaks. Label the absorption bands in the IR spectrum indicated by the arrows.
INFRARED SPECTRUM
1
0.975
3000
2000
Wavenumber (cm-1)
1000
Structure with assigned H peaks
1
3
180 160 140 120
100
f1 (ppm)
80 60
40
20
0
C-13 NMR
note that there are 4
peaks between 120-140ppm
Integral values equal
the number of
equivalent protons
10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
fl (ppm)
Calculate the pH of 0.0025 M phenol.
In the following reaction, the OH- acts as which of these?
NO2-(aq) + H2O(l) ⇌ OH-(aq) + HNO2(aq)
Chapter 26 Solutions
Principles of Instrumental Analysis
Ch. 26 - Prob. 26.1QAPCh. 26 - Prob. 26.2QAPCh. 26 - Prob. 26.3QAPCh. 26 - Prob. 26.4QAPCh. 26 - Prob. 26.5QAPCh. 26 - Prob. 26.6QAPCh. 26 - Prob. 26.7QAPCh. 26 - Prob. 26.8QAPCh. 26 - Prob. 26.9QAPCh. 26 - Prob. 26.10QAP
Ch. 26 - Prob. 26.11QAPCh. 26 - Prob. 26.12QAPCh. 26 - Prob. 26.13QAPCh. 26 - Prob. 26.14QAPCh. 26 - Prob. 26.15QAPCh. 26 - Prob. 26.16QAPCh. 26 - From the data in Problem 26-14, calculate for...Ch. 26 - Prob. 26.18QAPCh. 26 - Prob. 26.19QAPCh. 26 - Prob. 26.20QAPCh. 26 - Prob. 26.21QAPCh. 26 - Prob. 26.22QAPCh. 26 - Prob. 26.23QAP
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- Using spectra attached, can the unknown be predicted? Draw the predicition. Please explain and provide steps. Molecular focrmula:C16H13ClOarrow_forwardCalculate the percent ionization for 0.0025 M phenol. Use the assumption to find [H3O+] first. K = 1.0 x 10-10arrow_forwardThe Ka for sodium dihydrogen phosphate is 6.32 x 10-8. Find the pH of a buffer made from 0.15 M H2PO4- and 0.25 M HPO42- .arrow_forward
- The Ka for lactic acid is 1.4 x 10-4. Find the pH of a buffer made from 0.066 M lactic acid and 0.088 M sodium lactate.arrow_forwardZaitsev's Rule 3) (a) Rank the following alkenes in order of decreasing stability. most stable A B C D > > > (b) Rank the following carbocations in order of decreasing stability least stable B C Darrow_forwardCalculate the pH of 0.25 M acetic acid.arrow_forward
- For each of the following reactions: Fill in the missing reactant, reagent, or product (s), indicating stereochemistry where appropriate using dashed and wedged bonds. If the reaction forms a racemic mixture, draw both structures in the box and write the word “racemic”.arrow_forward5) Using the carbon-containing starting material(s), propose a synthesis based on the following retrosynthetic analysis. Provide structures for all intermediates. The carbon atoms in the product must originate from the starting material(s), but you may use as many equivalents of each starting material as you would like, and any reagent/reaction you know (note: no mechanisms are required). H H =arrow_forwardCalculate the percent ionization for 0.0025 M phenol. Use the assumption to find [H3O+] first. K = 1.0 x 10-10arrow_forward
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