Question & Answer: In the reaction: NH_3(aq) + H_2PO^-_4 (aq) doubleheadarrow NH (aq) + HPO^2-_4 (aq)…..

In the reaction: NH_3(aq) + H_2PO^-_4 (aq) doubleheadarrow NH (aq) + HPO^2-_4 (aq) the dihydrogen ion, H_2PO^-_4, act as 1) an oxidizing agent. 2) a reducing agent. 3) an acid. 4) a base. Which equilibrium constant expressions represents the first ionization of H_3PO_4 in water? 1) K = [H_3O^+][H_2PO^-_4]/[H_3PO_4] 2) K = [H_3O^+][PO^3-_4]/[HPO^2-_4] 3) K = [H_3O^+][HPO^-2_4]/H_2PO^-_4 4) [H_3O^+][PO^-3_4]/[H_3PO_4] Which is a property of a base? 1) the ability to neutralize CH_3COOH 2) turns litmus red 3) a sour taste 4) the ability to react with Zn to produce H_2 (g)