Calculation of the regions of solid phase precipitations in the metal ion-water-complexing agent systems

Diagrams of the formation of In2S3 and In2Se3 films on vitroceramic upon precipitation, according to potentiometric titration

“…As was shown in [7], a quite reliable model of a metal ion-water-complexing agent system can be plotted using the data from potentiometric titration. This enables us to determine rather quickly the pres ence of various complex forms of metal in solution and find the optimum pH value for the precipitation of required phase.…”

“…The stoichiometric composition of the evolved solid phase can be estimated by projecting the curve's plateau onto the ordinate axis [7]. As follows from Fig.…”

“…Potentiometric titration was performed according to the generally accepted procedure using 0.100 to 0.0001 M solutions of indium salt InCl 3 and alkali solutions NaOH (both of pure for analysis grade) and a pH 121 pH meter. The results from titration were processed with the EQ 5 program designed and pro posed in [7].…”

“…Potentiometric titration of a solution notably corrects the conditions for the formation of solid phases. In [7], an original procedure for treating the results from such titration was proposed that ensured a marked increase in the precision of predictions. Build ing a mathematical model of the system lays a founda tion that includes not only the stability constants of the main components in a solution, but also the constants of complex compounds in negligibly small concentra tions that nevertheless affect its precipitation [8].…”

New Conditions of Saturation of Aqueous Solutions for the Modeling of Regions of Solid Phases

“…Description of regions of formation of different types of precipitates, which are formed in a single system; by applying the rules of molecular solubility, solubility by intermediate, choosing the precipitate of priority; in addition to the rule of solubility product [1,2].…”