(a) The pH at which average net glycine is +0.5. (b) The pH that is equal to the pKa of the protonated amino group. (c) The pH at which the predominant glycine species is "NH3-CH2-COOH

Fundamentals Of Analytical Chemistry
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Chapter16: Applications Of Neutralization Titrations
Section: Chapter Questions
Problem 16.20QAP
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12
J1.30
10
9,60
(IV)
8.
pH
6 5.97
CIII)
4
2.34
(1I)
(I)
0.5
1.0
1.5
2.0
OH- (equivalents)
1. In your laboratory exercise you titrated 100 mL of solution of 0,1 M glycine at pH
1.72 with 2M NaOH solution. She monitored the pH and plotted the graph shown
above. For each of the following statements, identify the appropriate pH in the
titration.
(a) The pH at which average net glycine is +0.5.
(b) The pH that is equal to the pKa of the protonated amino group.
(c) The pH at which the predominant glycine species is "NH3-CH2-COOH
(d) The pH at which the average net charge of glycine is -1
(e) The isoelectric pH (pl) of glycine.
2.
Transcribed Image Text:FREE RESPONSE 12 J1.30 10 9,60 (IV) 8. pH 6 5.97 CIII) 4 2.34 (1I) (I) 0.5 1.0 1.5 2.0 OH- (equivalents) 1. In your laboratory exercise you titrated 100 mL of solution of 0,1 M glycine at pH 1.72 with 2M NaOH solution. She monitored the pH and plotted the graph shown above. For each of the following statements, identify the appropriate pH in the titration. (a) The pH at which average net glycine is +0.5. (b) The pH that is equal to the pKa of the protonated amino group. (c) The pH at which the predominant glycine species is "NH3-CH2-COOH (d) The pH at which the average net charge of glycine is -1 (e) The isoelectric pH (pl) of glycine. 2.
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