A certain buffer solution contains equal P concentration of \( \mat...

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A certain buffer solution contains equal
P concentration of \( \mathrm{X}^{\ominus} \) and \( \mathrm{HX} \). The \( \mathrm{K}_{\mathrm{b}} \) for \( \mathrm{X}^{\ominus} \) is \( 10^{-10} \).

W The \( \mathrm{pH} \) of the buffer is
(1) 4
(2) 7
(3) 10
(4) 14
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