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Buffer solution A of a weak monoprotic acid and
P its sodium salt in the concentration ratio \( x: y \) has

W \( \mathrm{pH}=(\mathrm{pH})_{1} \). Buffer solution \( \mathrm{B} \) of the same acid and its sodium salt in the concentration ratio \( y: x \) has \( \mathrm{pH}=(\mathrm{pH})_{2} \). If \( (\mathrm{pH})_{2}-(\mathrm{pH})_{1}=1 \) unit and \( (\mathrm{pH})_{1}+(\mathrm{pH})_{2}=9.5 \) units, then: find \( \mathrm{pK}_{\mathrm{a}} \) ?
(1) \( \mathrm{pK}_{\mathrm{a}}=5.25 \)
(2) \( \mathrm{pK}_{\mathrm{a}}=4.00 \)
(3) \( \mathrm{pK}_{\mathrm{a}}=3.75 \)
(4) \( \mathrm{pK}_{\mathrm{a}}=4.75 \)
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