A researchers titrated a 100mL solution of 0.1M glycine at pH 1.72 with 2 M NaOH solution. She then monitored the pH and plotted the results in the graph shown here. The key points in the titration are designated I through V. For each of the statements, identify the appropriate key point in the titration. PromptsSubmitted AnswersThe predominant glycine species is +H3N-CH2-COOH.Choose a matchGlycine predominantly exists as a 50:50 mixture of +H3N-CH2-COOH and +H3N-CH2-COO-.The isoelectric point of glycine.The pH is equal to the pka of the protonated amino group.VThe predominant glycine species is H2N-CH2-CoO-.noneAdditional contentIV 1211.30(V)109.60(IV)8pH6 5.97(III)42.342(1I)(1)0.51.01.52.0OH- (equivalents)

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Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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A researchers titrated a 100mL solution of 0.1M glycine at pH 1.72 with 2 M NaOH solution. She then monitored the pH and plotted the results in the graph shown here. The key points in the titration are designated I through V. For each of the statements, identify the appropriate key point in the titration.

Prompts
Submitted Answers
The predominant glycine species is +H3N-CH2-COOH.
Choose a match
Glycine predominantly exists as a 50:50 mixture of +H3N-CH2-
COOH and +H3N-CH2-COO-.
The isoelectric point of glycine.
The pH is equal to the pka of the protonated amino group.
V
The predominant glycine species is H2N-CH2-CoO-.
none
Additional content
IV

12
11.30
(V)
10
9.60
(IV)
8
pH
6 5.97
(III)
4
2.34
2
(1I)
(1)
0.5
1.0
1.5
2.0
OH- (equivalents)

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