The dissociation constant of a weak acid is \( 1 \times 10^{-4} \)....

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The dissociation constant of a weak acid is \( 1 \times 10^{-4} \). In order to prepare a buffer solution with a \( \mathrm{pH}=5 \),
P the \( [ \) Salt \( ] /[ \) Acid] ratio should be

W
(a) \( 4: 5 \)
(b) \( 10: 1 \)
(c) \( 5: 4 \)
(d) \( 1: 10 \)
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