Consider the neutral form of the amino acid histidine a) When the neutral form of the amino acid histidine (HA) is titrated with HClO4, write the sequence of reactions that occur. Draw structures of reactants and products. b) Given a pH of 3.00, how many mL of 0.050 0 M HCl04 should be added to 25.0 mL of 0.0400 M HA? (H3A2+-H2A+-HA-A-)