Chapter 20, Problem 20.97AP

Interpretation Introduction

Interpretation: The amino acids, which are zwitterions at physiological $\text{pH}\left(\sim 7.4\right)$, but exist as neutral molecules are to be stated.

Concept introduction: The zwitterions are the molecules which comprises both positively and negatively charged groups.

Amino acid is the compound which comprises amino $\left(-{\text{NH}}_{\text{2}}\right)$ group and carboxyl $\left(-\text{COOH}\right)$ functional group.

The isoelectric point is the $\text{pH}$ at which the amino acid molecule have zero charge.

To determine: The amino acids, which are zwitterions at physiological $\text{pH}\left(\sim 7.4\right)$, but exist as neutral molecules.