Abstract
A linear plot method for determining the stability constants of complex systems is presented. It gives high accuracy because side-reactions of both the metal ion and ligand and the difference between the total ligand and free ligand concentration are incorporated in the general equations. This method is also suitable for determining the constant of complexes of very low stability. The effectiveness is demonstrated on the barium-glycine (GLY) system, the zinc-thiocyanate (SCN) system and the lead-fluoride system by spectrophytometry and potentiometry. The values of the complex stability constants are logβ1 = −0.374 (Ba-GLY system), logβ1=0.72 and logβ2=1.86 (Zn-SCN system) and logβ1=1.39, logβ2=2.56 (Pb-F system).
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