Answer
$H_2PO_4^- + OH^-$ -> $H_2O + HPO_4^{2-}$
$HPO_4^{2-} + H^+$ -> $H_2PO_4^-$
Work Step by Step
$H_2PO_4^- + OH^-$ -> $H_2O + HPO_4^{2-}$
$HPO_4^{2-} + H^+$ -> $H_2PO_4^-$
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