1. The pKa corresponding to the deprotonation of the a-amino group. 2. The pKa corresponding to the deprotonation of the R-group. 3. The pKa corresponding to the dissociation of the a-carboxyl group.

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Chapter1: Chemical Foundations
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1. The pka corresponding to the deprotonation of the a-amino
group.
2. The pka corresponding to the deprotonation of the R-group.
3. The pKa corresponding to the dissociation of the a-carboxył
group.
4. The key point which corresponds to the IpH of the amino acid.
5. The amino acid is predominantly present in its cationic form.
Transcribed Image Text:1. The pka corresponding to the deprotonation of the a-amino group. 2. The pka corresponding to the deprotonation of the R-group. 3. The pKa corresponding to the dissociation of the a-carboxył group. 4. The key point which corresponds to the IpH of the amino acid. 5. The amino acid is predominantly present in its cationic form.
A hypothetical a-amino acid with an acidic side chain (less acidic than the a-carboxylic
acid group) was titrated with 1.0 M NaOH solution. The pH was monitored, and the
results were plotted on a graph, as shown below. For each of the statements (1 to 5),
identify the appropriate key point (I to VII) in the titration curve.
VII
12
10
VI
pH 6
IV
III
%3D
0.5
1
1.5
2
2.5
3
3.5
OH equivalents
Transcribed Image Text:A hypothetical a-amino acid with an acidic side chain (less acidic than the a-carboxylic acid group) was titrated with 1.0 M NaOH solution. The pH was monitored, and the results were plotted on a graph, as shown below. For each of the statements (1 to 5), identify the appropriate key point (I to VII) in the titration curve. VII 12 10 VI pH 6 IV III %3D 0.5 1 1.5 2 2.5 3 3.5 OH equivalents
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