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The acid–base chemistry of multidentate (bio)ligands are usually characterized in terms of macroscopic protonation constants, log10K (or pK), which are composites of the microscopic constants (log10k or pk) for the individual groups. In this study, macroscopic protonation constants of some α-amino acid (glycine, l-alanine, l-valine, l-leucine, l-phenylalanine, l-serine) and protonation constants...