Why is the concentration constant of stability not suitable for assessing the strength of complexonates during titration?

The concentration constant of stability is not suitable for assessing the strength of complexonates during titration, since it does not take into account the decrease in the concentration of Y4 ions due to their protonation at pH <11 and the decrease in the concentration of free metal ions during the formation of side complexes with inorganic ligands of the titrated system.

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