Chemical and Ionic Equilibrium - Result Question 127

####70. Freshly precipitated aluminium and magnesium hydroxides are stirred vigorously in a buffer solution containing 0.25mol/Lof NH4Cl and 0.05M of ammonium hydroxide. Calculate the concentration of aluminium and magnesium ions in solution.

Kb[NH4OH]=1.8×105 Ksp [Mg(OH)2]=8.9×1012 Ksp [Al(OH)3]=6×1032

(1989, 3M)

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Solution:

  1. pOH of buffer solution =pKb+log[NH4+][NH4OH]

=log(1.8×105)+log0.250.05=5.44 [OH]=3.6×106M [Al3+]=Ksp [OH]3=6×1032(3.6×106)3=1.28×1015M [Mg2+]=Ksp [OH]2=8.9×1012(3.6×106)2=0.68M



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