H₂PO₄- is an amphiprotic ion since it has both a conjugate acid and a conjugate base. Identify both the conjugate acid and the conjugate base.
a) H₃PO₄ is the conjugate acid and H2PO3- is the conjugate base.
b) HPO₄²- is the conjugate base and H3PO4 is the conjugate acid.
c) HPO₄²- is the conjugate acid and H3PO4 is the conjugate base.
d) H₂PO₃²- is the conjugate base and H₂PO₂ is the conjugate acid.