Complexation processes in aqueous solutions of lead acetate and thiourea
Abstract
Purpose: The aim of the article is to study the processes of complexation in aqueous solutions containing lead acetate and thiourea and to establish the optimal concentration regions for the existence of thiocarbamide coordination compounds.
Modeling: The study of ionic equilibria was carried out by means of theoretical calculation taking into account the stability constants of various complex forms. Slices of concentration dependences of fractions of coordination compounds on initial concentrations of lead ions and thiourea, as well as predominance diagrams and distribution diagrams in three-dimensional space were constructed using the COMSOL Multiphysics application package by the Newton-Raphson method.
Conclusions: concentration ranges of existence of coordination compounds formed in aqueous solutions of lead acetate and thiourea at varying concentrations of components have been determined. It was revealed that at low concentrations of lead salt in solution the homogeneously liganded thiourea complexes dominate. With increasing thiocarbamide concentration, the total fraction of homogeneously liganded and dissimilarly liganded thiourea coordination compounds increases
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