Thermodynamic characteristics of the amphoterism of M(OH)2hydroxides in aqueous mediaстатья
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Аннотация:The influence of pH value of aqueous-alkaline non-oxidizing medium on molar solubility of amorphous and crystalline hydroxides M(OH)2 , where M = Sn, Pb, 3d- element Mn - Cu, was calculated by thermodynamic method taking into account the formation of hydroxocomplexes. The pH values of the most complete precipitation of hydroxides were determined. Calculation of thermodynamic constants of heterogeneous acid-base equilibria in aqueous media, as well as step constants of basicity and acidity of dissolved molecules of M(OH)2 indicates the predominance of weak basic properties over weak acidic properties of ampholites M(OH)2 , where M = Вe, Mn - Zn, Cd, Pb.