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(1) HPO(4)^(2-) can act both as a Bronst...

(1) `HPO_(4)^(2-)` can act both as a Bronsted base and as a Bronsted acid. Write the equation of equilibrium established by `HPO_(4)^(2-)` as an acid and a base in aqueous solution. Also write the expressions of `K_(a) & K_(b)` in two cases.
(2) What are the conjugate acid and base of `HS^(-)`?

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