Figure 26-22 shows the separation of substituted benzoates. There is a peak of unknown identity at 86.0
Question:
Figure 26-22 shows the separation of substituted benzoates. There is a peak of unknown identity at 86.0 s.86.0 s.
a. Is the unknown a cation, neutral, or an anion?
b. Find the apparent mobility and electrophoretic mobility of the unknown peak.
Figure 26-22
Transcribed Image Text:
Absorbance → rumah Methanol 0.0 Benzoate 2.5 5.0 Migration time (min) Harris/Lucy, Quantitative Chemical Analysis, 10e, © 2020 W. H. Freeman and Company 2-Methylbenzoate 7.5 FIGURE 26-22 Capillary electrophoresis separation of substituted benzoic acids prepared by a student using the Grignard reaction. Electrophoresis carried out at pH 4.20PH 4.20 (pkapKa of benzoic acid) using 5 mM 5 mM acetate buffer at 2.50x1042.50 x 10 VV in a capillary with a length of 0.500 m0.500 m and a distance to the detector of 0.400 m.0.400 m. The negative baseline deflection from methanol in the sample was used to measure the electroosmotic flow.
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Related Book For
Quantitative Chemical Analysis
ISBN: 9781319164300
10th Edition
Authors: Daniel C. Harris, Charles A. Lucy
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