A 100 mL solution of 0.1 M amino acid (AA) at pH 1.0 was titrated with NAOH solution. The pH was monitored, and the results were plotted on a graph, as shown below. The key points in the titration are designated I to VII. 14 12 VII 10 VI V IV 8 pH 6 III 4 2 II 0.5 1 1.5 2 2.5 3 Equivalents of OH a. What is the possible identity of the amino acid? (Choices: lysine, proline, aspartic acid, alanine) b. What is the isoelectric point of AA? (Choices: I, II, III, IV, V, VI, VII, VIII, IX, X)

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A 100 ml solution of 0.1 M amino acid (AA) at pH 1.0 was titrated with NaOH solution. The pH was monitored, and the results were plotted on a graph, as shown below. The key points in
the titration are designated I to VII.
14 -
12
VII
10
VI
V
IV
pH 6
III
4
2
II
0.5
1
1.5
2
2.5
3
Equivalents of OH
a. What is the possible identity of the amino acid? (Choices: lysine, proline, aspartic acid, alanine)
b. What is the isoelectric point of AA? (Choices: I, II, III, IV, V, VI, VII, VIII, IX, X)
c. What is the pKa corresponding to the deprotonation of the alpha-amino group? (Choices: 10.50, 2.10, 6.00, 9.00)
Transcribed Image Text:A 100 ml solution of 0.1 M amino acid (AA) at pH 1.0 was titrated with NaOH solution. The pH was monitored, and the results were plotted on a graph, as shown below. The key points in the titration are designated I to VII. 14 - 12 VII 10 VI V IV pH 6 III 4 2 II 0.5 1 1.5 2 2.5 3 Equivalents of OH a. What is the possible identity of the amino acid? (Choices: lysine, proline, aspartic acid, alanine) b. What is the isoelectric point of AA? (Choices: I, II, III, IV, V, VI, VII, VIII, IX, X) c. What is the pKa corresponding to the deprotonation of the alpha-amino group? (Choices: 10.50, 2.10, 6.00, 9.00)
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