Equilibrium Question 842

Question: A solution of NH4Cl 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.

Options:

A) Ba(OH)2(Ksp=1.1×104)

B) Mg(OH)2(Ksp=3.5×104)

C) Fe(OH)2(Ksp=8.1×1016)

D) Ca(OH)2(Ksp=2.1×105).

Show Answer

Answer:

Correct Answer: C

Solution:

pH=8,pOH=6;[OH]=106M Ionic product of Fe(OH)2=0.2×(1×106)2

=2×1013>Ksp(=8.1×1016)



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