Mathermatical modeling of equilibria and the state of holmium heteropoly tungstate ions

The interaction in the HoW₁₀O ₃₆ ^9? -H⁺-OH^?-H₂O system is studied using pH titration at cH0W₁₀O ₃₆ ^9? = 10^?3 mol/l in various base electrolytes (NaNO₃, NaCl, Na₂SO₄). The pH titration data are used to simulate the processes in the solution in ranges of z _H ⁺ = 0?6.5 and z _OH ⁺ = (?4)-0. The concentration and thermodynamic equilibrium constants are calculated, and heteropolytungstate anion (HPTA) distribution diagrams are plotted. Thallium salts are synthesized in the regions of dominant existence of heteropoly anions H_nHoW₁₀O ₃₆ ^(9?n)? (n = 2?4). The compounds are identified using chemical analysis and IR spectroscopy.