PKPOT, A PROGRAM FOR THE POTENTIOMETRIC STUDY OF IONIC EQUILIBRIA IN AQUEOUS AND NONAQUEOUS MEDIA

The least-squares computer program PKPOT has been developed to run on a PC-compatible computer, for the study of ionic equilibria from poten tiometric data. It allows for the refinement of equilibrium constants in systems described by up 5 components and 20 complex species A(p)B(q )C(r)D(s)H(t). Other parameters (standard potentials of electrode, rea ctant concentrations, etc.) can also be refined. The program can deal with up to ten titration curves. It provides several statistical tests , as also graphics presentations of data and residuals distribution. T he program allows for the determination of stoichiometric formation co nstants (at fixed ionic strength), or thermodynamic constants; in this case, corrections for changes on the activity coefficients are taken into account. The data analysed can be given as volume/e.m.f. or volum e/pH. Several application examples are given, including titrations in aqueous and non-aqueous media.