Chapter 20, Problem 20.19QP

Interpretation Introduction

Interpretation: The reason for the existence of the amino acid in the zwitterionic form at the physiological $\text{pH}$ of $7.4$ is to be stated.

Concept introduction: Zwitter ion is the ion in which a cationic and the anionic forms are observed in the same molecule. When the $\text{pH}$ of the solution is less than $\text{p}{K}_{\text{a}}$ of the acid, the acid exist in protonated form.

To determine: The reason for the existence of the amino acid in the zwitterionic form at the physiological $\text{pH}$ of $7.4$.