Extra: Lewis Acid-Base (Complex Ion) Equilibria

• Lewis acid-base reactions can also reach a state of equilibrium

• Metal ion + ligand ? complex ion

• Kf = [complex ion]/[metal ion][ligand] (formation constant)

• Hg2+ + 4I- ? HgI42-

• Kf = [HgI42-]/[Hg2+][I-]4

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