Freshly precipitated aluminium and magnesium hydroxides are stirred vigorously in a buffer solution containing 0.25mol/L of NH4Cl and 0.05M of ammonium hydroxide. Calculate the concentration of aluminium and magnesium ions in solution
Kb[NH4OH] = 1.8 x 10-5
Ksp[Mg(OH)2] = 8.9 x 10-12
Ksp [A(oH)3 ] = 6 x 10-32