Answer
See answer below.
Work Step by Step
Acid:
$H_2PO_4^-(aq)+CO_3^{2-}(aq)\rightarrow HPO_4^{2-}(aq)+HCO_3^-(aq)$
Base:
$HPO_4^{2-}(aq)+CH_3CO_2H(aq)\rightarrow H_2PO_4^{-}(aq)+CH_3CO_2^-(aq)$
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