Abstract
pH-potentiometry and mathematical modeling were used to study interactions in the system \( {\text{Ni}}^{2 +}{-}{\text{MoO}}_{4}^{2 -}{-}{\text{H}}^{ + } {-}{\text{H}}_{ 2} {\text{O}} \) acidified to mole ratio \( Z = \nu ({\text{H}}^{ + } )/\nu \left( {{\text{MoO}}_{4}^{2 - } } \right) = 1.00 \), within the acidity interval Z = 0.6–2.5 at 298 ± 0.1 K, with background electrolyte NaNO3 (I = 0.1–0.5 mol·dm−3). Previously unknown thermodynamic constants and Gibbs energies for the formation reactions of Anderson type heteropoly anions H x [Ni(OH)6M6O18](4−x)− (M = Mo, W) from \( {\text{MoO}}_{4}^{2 - } \) and H+, as well as their standard Gibbs energies of formation \( \Delta G_{\text{f}}^{0} \), were calculated. For the first time, the speciation schemes of the ions in Ni2+–\( {\text{MoO}}_{4}^{2 - } \)–H+–H2O (M = Mo, W) solutions are proposed.
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The present study was financially supported by the Ministry of Education and Science of Ukraine, Grant ID 0113U001530.
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Gumerova, N.I., Notich, A.V., Rozantsev, G.M. et al. pH-Metric Studies on the Interaction of Ni-Containing Anderson Type Heteropolyanions in Aqueous Solution. J Solution Chem 45, 849–860 (2016). https://doi.org/10.1007/s10953-016-0471-0
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DOI: https://doi.org/10.1007/s10953-016-0471-0