To cite this article: Olena Yu. Poimanova, Sergii V. Radio, Katerina Ye. Bilousova, Vyacheslav N. Baumer & Georgiy M. Rozantsev (2014): Equilibria in the acidified aqueous-dimethylformamide solutions of tungstate-anion. Synthesis, crystal structure and characterization of decatungstate [BaThe formation and transformation of isopolytungstates in the system Na 2 WO 4 -HCl -NaCl -DMF -H 2 O with different dimethylformamide (DMF) concentrations have been studied by single-point pH-potentiometric titration and the subsequent modeling of the equilibria processes. The modeling of equilibria resulted in data necessary to synthesize barium decatungstate, [Ba(H 2 O) 2 (C 3 H 7 NO) 3 ] 2 [W 10 O 32 ]·(C 3 H 7 NO) 2 . The salt was characterized by elemental and EDX spectral analysis, SEM, FTIR spectroscopy, thermal analysis, single-crystal X-ray diffraction analysis in solid state, and by UV-Vis. spectroscopy in solution.