how is the formation of metal complexes dependent upon pKa?please give me a brief and compact answer,its urgent

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jerichorayel | College Teacher | (Level 2) Senior Educator

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pKa is the acid dissociation constant or the measure of strength of acid in a solution. This affects the formation of the complexes since the reaction is dynamic meaning reversible. Consider the equation

HL <-> H+ + L-    (dissociation of ligand in a solution)

M + L- <-> ML      (formation of metal ligand complex)

M = metal 

L = Ligand

ML = Metal Ligand complex.

To determine the Keq or the equilibrium constant for the reaction M + L -> ML, in which the ligand loses a proton, the pKa of the protonated ligand must be known.


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