Mean number of ligands bound

The experimental data is sometimes also analysed in terms of the mean number of ligands, L, bound per M  

This definition is analogous to the definition of the mean number of bound protons on a polybasic acid, a quantity much used by biochemists, though less often used by chemists. 

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In acid-base titrations, a difference plot, or Bjerrum plot, is a graph of the mean fraction of protons bound to an acid versus pH. The mean fraction is nH calculated with Equation 13-59. For complex formation, the difference plot gives the mean number of ligands bound to a metal versus pL(= —log[ligand]). 

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