Which of the following is a buffer solution?

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(C) buffer solution is typically composed of a weak acid and its conjugate base or a weak base and its conjugate acid. Specifically,the mixture of $H_

Vedclass · Accepted Answer

$[HPO_4^{2-}] , [H_2PO_4^{-}]$

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(C) buffer solution is typically composed of a weak acid and its conjugate base or a weak base and its conjugate acid. Specifically,the mixture of $H_2PO_4^-$ (dihydrogen phosphate,acting as a weak acid) and $HPO_4^{2-}$ (hydrogen phosphate,acting as its conjugate base) forms a well-known buffer system in biological fluids. Therefore,the pair $[HPO_4^{2-}] , [H_2PO_4^{-}]$ constitutes a buffer solution.

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