Based on the equation below, which ion plays the role of hydrogen-ion donor (acid) and which ion plays the role of hydrogen-ion acceptor (base) in pbs? h2po4-(aq) h+(aq) + hpo42-(aq)

basically h2po4 is hydrogen donor and hpo4 is the conjugate base.

and after addition of strong acid and base the equilibrium will shift in opposite direction.

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what image you forgot to include it.