caa a22 4500 445328401 CHVBK 20180317142729.0 cr unu---uuuuu 170323e20110401xx s 000 0 eng 10.1007/s10953-011-9670-x doi (NATIONALLICENCE)springer-10.1007/s10953-011-9670-x Solubility Measurements of Crystalline NiO in Aqueous Solution as a Function of Temperature and pH [Elektronische Daten] [Donald Palmer, Pascale Bénézeth, Caibin Xiao, David Wesolowski, Lawrence Anovitz] Results of solubility experiments involving crystalline nickel oxide (bunsenite) in aqueous solutions are reported as functions of temperature (0 to 350 °C) and pH at pressures slightly exceeding (with one exception) saturation vapor pressure. These experiments were carried out in either flow-through reactors or a hydrogen-electrode concentration cell for mildly acidic to near neutral pH solutions. The results were treated successfully with a thermodynamic model incorporating only the unhydrolyzed aqueous nickel species (viz., Ni2+) and the neutrally charged hydrolyzed species (viz., $\mathrm{Ni(OH)}_{2}^{0})$ . The thermodynamic quantities obtained at 25 °C and infinite dilution are, with 2σ uncertainties: $\log_{10}K_{\mathrm{s0}}^{\mathrm{o}} = (12.40 \pm 0.29),\varDelta_{\mathrm{r}}G_{m}^{\mathrm{o}} = -(70. 8 \pm 1.7)$ kJ⋅mol−1; $\varDelta_{\mathrm{r}}H_{m}^{\mathrm{o}} = -(105.6 \pm 1.3)$ kJ⋅mol−1; $\varDelta_{\mathrm{r}}S_{m}^{\mathrm{o}} =-(116.6 \pm 3.2)$ J⋅K−1⋅mol−1; $\varDelta_{\mathrm{r}}C_{p,m}^{\mathrm{o}} = (0 \pm 13)$ J⋅K−1⋅mol−1; and $\log_{10}K_{\mathrm{s2}}^{\mathrm{o}} = -(8.76 \pm 0.15)$ ; $\varDelta_{\mathrm{r}}G_{m}^{\mathrm{o}} = (50.0 \pm 1.7)$ kJ⋅mol−1; $\varDelta_{\mathrm{r}}H_{m}^{\mathrm{o}} = (17.7 \pm 1.7)$ kJ⋅mol−1; $\varDelta_{\mathrm{r}}S_{m}^{\mathrm{o}} = -(108\pm 7)$ J⋅K−1⋅mol−1; $\varDelta_{\mathrm{r}}C_{p,m}^{\mathrm{o}} = -(108 \pm 3)$ J⋅K−1⋅mol−1. These results are internally consistent, but the latter set differs from those gleaned from previous studies recorded in the literature. The corresponding thermodynamic quantities for the formation of Ni2+ and $\mathrm{Ni(OH)}_{2}^{0}$ are also estimated. Moreover, the $\mathrm{Ni(OH)}_{3}^{ -}$ anion was never observed, even in relatively strong basic solutions ( $m_{\mathrm{OH}^{ -}} = 0.1$ mol⋅kg−1), contrary to the conclusions drawn from all but one previous study. Springer Science+Business Media, LLC, 2011 Nickel oxide nationallicence Bunsenite nationallicence Ni(II) nationallicence Solubility nationallicence Thermodynamics nationallicence Hydrolysis nationallicence Aqueous solutions nationallicence Temperature nationallicence pH nationallicence Palmer Donald Chemical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, 37831-6110, Oak Ridge, TN, USA aut Bénézeth Pascale Geosciences Environnemental Toulouse (GET), UMR-5563 CNRS/IRD/Université de Toulouse, 14 Avenue Edouard Belin, 31400, Toulouse, France aut Xiao Caibin Barclay Water Management, Inc., 150 Coolidge Ave., 02472-2815, Watertown, MA, USA aut Wesolowski David Chemical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, 37831-6110, Oak Ridge, TN, USA aut Anovitz Lawrence Chemical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, 37831-6110, Oak Ridge, TN, USA aut Journal of Solution Chemistry Springer US; http://www.springer-ny.com 40/4(2011-04-01), 680-702 0095-9782 40:4<680 2011 40 10953 https://doi.org/10.1007/s10953-011-9670-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10953-011-9670-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Palmer Donald Chemical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, 37831-6110, Oak Ridge, TN, USA aut NATIONALLICENCE 700 1- Bénézeth Pascale Geosciences Environnemental Toulouse (GET), UMR-5563 CNRS/IRD/Université de Toulouse, 14 Avenue Edouard Belin, 31400, Toulouse, France aut NATIONALLICENCE 700 1- Xiao Caibin Barclay Water Management, Inc., 150 Coolidge Ave., 02472-2815, Watertown, MA, USA aut NATIONALLICENCE 700 1- Wesolowski David Chemical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, 37831-6110, Oak Ridge, TN, USA aut NATIONALLICENCE 700 1- Anovitz Lawrence Chemical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, 37831-6110, Oak Ridge, TN, USA aut NATIONALLICENCE 773 0- Journal of Solution Chemistry Springer US; http://www.springer-ny.com 40/4(2011-04-01), 680-702 0095-9782 40:4<680 2011 40 10953 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer