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@article{350572, author = {Lubal, Přemysl and Perůtka, Jiří and Havel, Josef}, article_location = {Bratislava, Slovak Republic}, article_number = {5}, keywords = {Complex equilibria; chemical model determination; tungstate; tartaric acid}, language = {eng}, issn = {0366-6352}, journal = {Chem. Papers}, title = {Potentiometric study of Tungsten(VI) Complex Formation with Tartarate}, volume = {54}, year = {2000} }
TY - JOUR ID - 350572 AU - Lubal, Přemysl - Perůtka, Jiří - Havel, Josef PY - 2000 TI - Potentiometric study of Tungsten(VI) Complex Formation with Tartarate JF - Chem. Papers VL - 54 IS - 5 SP - 289 EP - 289 PB - Slovak Academy of Science SN - 03666352 KW - Complex equilibria KW - chemical model determination KW - tungstate KW - tartaric acid N2 - Complexation of tungstate with tartarate has been investigated by potentiometry in the pH range 2,5-7,5 in 1 M KNO3. The experimental data were evaluated with ESAB (for the calculation of protonation constants of tartarate) and OPIUM (for the formation constants of complexes) computer programs. A high number of chemical models including polynuclear complexes were considered and tested on a computer. The final model comprises five complexes that have a tungsten(VI):tartarate ratio 2:2 and 1:2. The following formation constants (Beta_pqr)were calculated: log Beta(212) = 16.6 +/- 0.1, log Beta(312) = 20.4 +/- 0.2, log Beta(412) = 23.9 +/- 0.1, log Beta(322) = 26.68 +/- 0.08, and log Beta(422) = 30.7 +/- 0.1, where p, q, r refer to stoichiometric coefficients in general formula (H)p(WO4)q(C4H4O6)r p-2q-2r. Structures of the complexes were proposed. ER -
LUBAL, Přemysl, Jiří PERŮTKA a Josef HAVEL. Potentiometric study of Tungsten(VI) Complex Formation with Tartarate. \textit{Chem. Papers}. Bratislava, Slovak Republic: Slovak Academy of Science, 2000, roč.~54, č.~5, s.~289-295. ISSN~0366-6352.
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