Consider an amino acid with an extra amino group in the side chain: arginine, add NaOH to achieve its dissociation, to dissociate first. H,N-CH-C-OH CH pK1 = 2,17 pK2 = 9,04 pKg = 12,48 NH C=NH NH Plot the ionized species of arginine at pH 1.9, pH equal to pK1, pH equal to pK2, and e pH equal to pKR and calculate the net charge. Identify a pH range at which arginine has no net charge and calculate pl, represent the Zwitterionic species.