Testing the adequacy of equilibrium models for complex formation Complexation between molybdate and oxalate revisited.
In potentiometric studies of metal-ligand equilibria a given model is tested by adjustment of the corresponding stability constants with the purpose of obtaining as good a fit as possible to the experimental data. When judging the goodness-of-fit it is of great importance to be in control of any possible systematic error in concentrations or electrode parameters. The molybdate-oxalate system is used to demonstrate how one crucial parameter influences the evaluations of goodness-of-fit. The system is simple, having only one complex species, MoO(3)oxal(2-), with logarithmic stability constant 13.816 in the pH-range 4-7.
Sylvest Johansen
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Royal Danish School of Pharmacy, Department of Pharmaceutical Chemistry AD, 2 Universitetsparken, DK-2100 Copenhagen, Denmark.
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