The dissociation constant of a weak acid \( \mathrm{HX} \) is P \( ...

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The dissociation constant of a weak acid \( \mathrm{HX} \) is
P \( 10^{-5} \). The buffer \( \mathrm{HX}+\mathrm{NaX} \) can be best used to

W maintain the \( \mathrm{pH} \) in the range
(1) \( 9-11 \)
(2) \( 2-4 \)
(3) \( 11-13 \)
(4) \( 4-6 \)
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