Consider the acid H3PO4. This acid will react with water by the following equation. H3PO4 + H2O ⇀ ↽ H2PO4− + H3O+. What will be true of the resulting conjugate base H2PO4−?
A) H2PO4− can act as an acid.
B) H2PO4− can act as a base.
C) H2PO4− can act as an acid or a base.
D) Depends on the substance