
Concept explainers
Interpretation: The pH or isoelectric point of glycine at which the given equation is true is to be calculated.
Concept introduction: Amino acids are defined as organic compounds which contain
To determine: The pH or isoelectric point of glycine at which the given equation is true.

Answer to Problem 145CP
Answer
The pH or isoelectric point of glycine is
Explanation of Solution
Explanation
The equilibrium constant for the given reaction is
The equilibrium constant
Given
The value of
The value of
The equilibrium constant is calculated by using the expression,
Substitute the value of
Hence,
By using equilibrium equation, the concentration of hydrogen ion at its isoelectric point is
The equilibrium constant for the given reaction is
The concentration of hydrogen ion at its isoelectric point is calculated by the equilibrium equation as follows,
Substitute the value of
Therefore, concentration of hydrogen ion is
The pH or isoelectric point of glycine is
Finally, the pH of glycine or isoelectric point of glycine is calculated by using the value of the hydrogen ion concentration using an expression,
Substitute the value of hydrogen ion concentration
Therefore, the pH of glycine is
Conclusion
The pH or isoelectric point of glycine at which the given equation is true is
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Chapter 22 Solutions
Chemistry with Access Code, Hybrid Edition
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