An aqueous solution at room temperature contains \( 0.1 \mathrm{M} \mathrm{NH}_{4} \mathrm{Cl} \....

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An aqueous solution at room temperature contains
\( \mathrm{P} \)
\( 0.1 \mathrm{M} \mathrm{NH}_{4} \mathrm{Cl} \) and \( 0.01 \mathrm{M} \mathrm{NH}_{4} \mathrm{OH}\left(\mathrm{pK}_{\mathrm{b}}=5\right) \) the \( \mathrm{pH} \) of the solution is:
(1) 7.5
(2) 6.8
(3) 6.5
(4) 8.0


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