A solution of \({\mathrm{NH}}_{4}\mathrm{Cl}\) and \({\mathrm{NH}}_{3}\) has pH = 8.0. Which of the following hydroxides…

\(\mathrm{Ba}{(\mathrm{OH})}_{2}({\mathrm{K}}_{\mathrm{sp}}=1.1\times {10}^{-4})\)

\(Mg{(\mathrm{OH})}_{2}({\mathrm{K}}_{\mathrm{sp}}=3.5\times {10}^{-4})\)

\(Fe{(\mathrm{OH})}_{2}({\mathrm{K}}_{\mathrm{sp}}=8.1\times {10}^{-16})\)

\(\mathrm{Ca}{(\mathrm{OH})}_{2}({\mathrm{K}}_{\mathrm{sp}}=2.1\times {10}^{-5})\)