CALCULUL TERMODINAMIC AL SOLUBILITĂȚII ȘI pH-ului SOLUBILITĂȚII MINIME A OXIZILOR ȘI HIDROXIZILOR PUȚIN SOLUBILI

Abstract

The equation for calculating the minimum solubility pH (pHmin) of sparingly soluble hydroxides and oxides with different compositions and natures under the conditions of polynuclear hydrolysis of the metal ion has been deduced. The deduced equation includes a parameter that characterizes the degree of formation of polynuclear hydroxocomplexes. For solubility calculations, the hydrolysis constants available in the literature or the formation constants of hydroxocomplexes, as well as the characteristic solubility product values of freshly precipitated sediments and the ionic product of water (Kw), have been utilized.