Abstract
Two independent methods are described for calculation of protonation constants of tribasic ligands: the logarithmic iterative procedure as well as the numerical method is used for the estimation of the relative sequence of p K or log K values respectively from the pH differences at n̄ = 0.5, 1.5 and 2.5 on the protonation curve. The convergence limits for the iterative procedure are given as a function of these pH differences. Closed expressions for the critical values of the iteration are presented for any pair of pH and n̄.
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