TPR FL1 B/B Q58 "SPOILER"

[betterfuture]

How in the world can Zn(OH)2 act as an acid but Fe(OH)2 cannot? Doesn't the common ion effect have a role or should we assume it doesn't because OH acts like a ligand? Also, both Zn and Fe are metals so why does one rxn favor one over the other? They could both be lewis acids, no?

Answer is C.

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[wizzed101]

A and B say the same thing so none of them can be the answer. D is flat out wrong since the common ion effect would shift both equilibrium to the left. All left is C which may or may not be true.

 

[aldol16]

Only way I can think of is Zn(II) is a good Lewis acid whereas Fe(II) is a poor one.