14 Report the approximate pK values for the amino acid whose titration curve is shown below. PH 7 1.0 2.0 3.0 [OH ] Lowest pK: [ Select ] Highest pK: [Salect ]
14 Report the approximate pK values for the amino acid whose titration curve is shown below. PH 7 1.0 2.0 3.0 [OH ] Lowest pK: [ Select ] Highest pK: [Salect ]
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
Related questions
Question
![**Titration Curve Analysis for Amino Acids**
Report the approximate pK values for the amino acid whose titration curve is shown below.
**Graph Explanation:**
The graph displayed shows a titration curve of an amino acid. The x-axis represents the concentration of hydroxide ions \([OH^-]\) added, ranging from 0 to 3. The y-axis represents the pH level, which ranges from 1 to 14.
The titration curve demonstrates two key inflection points:
1. The first inflection point, where the curve begins to rise sharply, indicates the deprotonation of the amino acid's carboxyl group.
2. The second inflection point, where the curve levels off again, indicates the deprotonation of the amino acid's amino group.
From this curve, the approximate pK values for the carboxyl and amino groups can be determined where these transitions occur.
**Interactive Selection:**
- **Lowest pK:** [Select from dropdown]
- **Highest pK:** [Select from dropdown]
These selections allow users to input their observations and conclusions based on the curve's inflection points.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F10115ea5-5f0e-4fb5-b400-8bf897ed7680%2Fc5fe9646-098a-47bb-b46e-9cba1fde9301%2Ff8bn8mi_processed.jpeg&w=3840&q=75)
Transcribed Image Text:**Titration Curve Analysis for Amino Acids**
Report the approximate pK values for the amino acid whose titration curve is shown below.
**Graph Explanation:**
The graph displayed shows a titration curve of an amino acid. The x-axis represents the concentration of hydroxide ions \([OH^-]\) added, ranging from 0 to 3. The y-axis represents the pH level, which ranges from 1 to 14.
The titration curve demonstrates two key inflection points:
1. The first inflection point, where the curve begins to rise sharply, indicates the deprotonation of the amino acid's carboxyl group.
2. The second inflection point, where the curve levels off again, indicates the deprotonation of the amino acid's amino group.
From this curve, the approximate pK values for the carboxyl and amino groups can be determined where these transitions occur.
**Interactive Selection:**
- **Lowest pK:** [Select from dropdown]
- **Highest pK:** [Select from dropdown]
These selections allow users to input their observations and conclusions based on the curve's inflection points.
Expert Solution
Step 1
When an amino acid is titrated, the functional group is neutralized from a low Pk value to a high Pka value. Whereas at a low Pka value all the amino acids will have a net positive charge and at a high Pka value all the amino acids will have a negative charge. Therefore, the point at which the amino acid consists of no net charge is called isoelectric point or zwitterion.
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