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20/10/2021 11:49 am
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A solution of NHCl4 and NH3 has pH = 8.0. Which of the following hydroxides may be precipitated when this solution is mixed with equal volume of 0.2 M of metal ion.
(a) Ba(OH)2(Ksp = 1.1 × 10-4)
(b) Mg(OH)2(Ksp = 3.5 × 10-4)
(c) Fe(OH)2(Ksp = 8.1 × 10-16)
(d) Ca(OH)2(Ksp = 2.1 × 10-5)
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20/10/2021 11:59 am
Correct answer: (c) Fe(OH)2(Ksp = 8.1 × 10-16)
Explanation:
pH = 8, pOH = 6; [OH-] = 10-6 M
Ionic product of Fe(OH)2 = 0.2 x (1 × 10-6)2
= 2 x 10-13 > (Ksp = 8.1 × 10-16)