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Q. The conjugate base of $ {{H}_{2}}P{{O}_{4}^-} $ is

ManipalManipal 2010Equilibrium

Solution:

Acid $- H^+ \to$ conjugate base
$ \therefore H_2PO_4^- - H^+ \to HPO_4^{2-} $
$ \therefore $ $ HPO_{4}^{2-} $ is the conjugate base of $ H_2PO_4^-$ .