An amino acid will have the form shown at

Question

Quizplus · Accepted Answer

An amino acid has both a positively charged amino group and a negatively charged carboxyl group. At a pH below the isoelectric point (pI), the solution will be acidic, with excess hydrogen ions. These hydrogen ions will react with the amino group on the amino acid to form an ammonium ion, giving the amino acid a net positive charge. At a pH above the pI, the solution will be basic, with excess hydroxide ions. These hydroxide ions will react with the carboxyl group on the amino acid to form a carboxylate ion, giving the amino acid a net negative charge. At the pI, the amino acid will have a neutral charge, meaning that it will not exist in either its protonated or deprotonated form. Therefore, a pH less than the pI is the best choice.

An Amino Acid Will Have the Form Shown at