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To prepare a buffer of \( \mathrm{pH} 8.26 \) amount of
P \( \left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4} \) to be added to \( 500 \mathrm{~mL} \) of \( 0.01 \mathrm{MNH}_{4} \mathrm{OH} \)

W solution is: \( \left[\mathrm{pK}_{\mathrm{a}}\left(\mathrm{NH}_{4}{ }^{+}\right)=9.26\right] \)
(1) 0.05 mole
(2) 0.025 mole
(3) 0.10 mole
(4) 0.005 mole
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