Glutamic acid (1 of the 20 amino acids) has a side-chain carboxyl group (COOH, pKA = 4.3) as shown in. a. Write the chemical equation for the dissociation of the side-chain COOH. Label the weak acid...

Glutamic acid (1 of the 20 amino acids) has a side-chain carboxyl group (COOH, pKA = 4.3) as shown in.

a. Write the chemical equation for the dissociation of the side-chain COOH. Label the weak acid and the conjugate base.

b. The Henderson–Hasselbalch equation can be used to determine the ionization status of a weak acid: pH = pKA + log [base] [acid] . Use the Henderson–Hasselbalch equation to determine whether the glutamic acid side-chain carboxyl group is protonated or deprotonated at physiological pH.