
Concept explainers
Glycine has pK2 values of 2.34 and 9.60. At what pH does glycine exist in the forms shown?
(a)

Interpretation:
The pH at which glycine exists at the given form has to be calculated.
Concept introduction:
The isoelectric point
The value of
Protons are released when the
Answer to Problem 49P
The pH of the glycine for the given form is
Explanation of Solution
In the given form of glycine,
The
The
Therefore,
The pH of the glycine for the given form is
(b)

Interpretation:
The pH at which glycine exists at the given form has to be calculated.
Concept introduction:
The isoelectric point
The value of
Protons are released when the
Explanation of Solution
In the given form of glycine,
The amount of positive charge and negative charge are equal or balanced for 100% system.
The isoelectric point (
Therefore,
The pH of the glycine for the given form is
(c)

Interpretation:
The
Concept introduction:
The isoelectric point
The value of
Protons are released when the
Answer to Problem 49P
The pH of the glycine for the given form is
Explanation of Solution
In the glycine form of glycine,
The
The
Therefore,
The pH of the glycine for the given form is
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Chapter 21 Solutions
Organic Chemistry (8th Edition)
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