Answered: Based on the given figure, a. what is…

Based on the given figure, a. what is the possible identity of the amino acid? b. what is the isoelectric point of AA c. what is the pKa corresponding to the dissociation of alpha carboxylic group

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter8: Polyfunctional Acids And Bases

Section: Chapter Questions

Problem 10P

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Question

Based on the given figure,
a. what is the possible identity of the amino acid?
b. what is the isoelectric point of AA
c. what is the pKa corresponding to the dissociation of alpha carboxylic group
d. where is the region or point where AA is predominantly present as a (-2) charged species
e. where is the effective buffering range for the amino acid on the acidic region

A 100 mL solution of 0.1 M amino acid (AA)
at pH 1.0 was titrated with 1.0 M 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.
12
VII
10 97
VI
8.
V
pH 6
43.9
20
IV
II
0.5
1.5
2
2.5
Equivalents of OH
3.
2)

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