caa a22 4500 44532791X CHVBK 20180317142727.0 cr unu---uuuuu 170323e20110701xx s 000 0 eng 10.1007/s10953-011-9723-1 doi (NATIONALLICENCE)springer-10.1007/s10953-011-9723-1 Thermodynamic Model for SnO2(cr) and SnO2(am) Solubility in the Aqueous Na+-H+-OH−-Cl−-H2O System [Elektronische Daten] [Dhanpat Rai, Mikazu Yui, H. Schaef, Akira Kitamura] The solubility of SnO2(cassiterite) was studied at 23±2 °C as a function of time (7to 49 days) and pH (0to 14.5). Steady state concentrations were reached in <7 days. The data were interpreted using the SIT model. The data show that SnO2(cassiterite) is the stable phase at pH values of < ∼11.7. These extensive data provided a log 10 K 0 value of −64.39±0.30 for the reaction (SnO2(cassiterite) +2H2O⇄Sn4++4OH−) and values of 1.86±0.30, ≤−0.62, −9.20±0.34, and −20.28±0.34 for the reaction ( $\mathrm{Sn}^{4+} + n\mathrm{H}_{2}\mathrm{O} \rightleftarrows \mathrm{Sn}(\mathrm{OH})_{n}^{4 - n} + n\mathrm{H}^{+}$ ) with values of "n” equal to 1, 4, 5, and 6 respectively. These thermodynamic hydrolysis constants were used to reinterpret the extensive literature data for SnO2(am) solubility, which provided a log 10 K 0 value of −61.80±0.29 for the reaction (SnO2(am)+2H2O⇄Sn4++4OH−). SnO2(cassiterite) is unstable under highly alkaline conditions (NaOH concentrations >0.003mol⋅dm−3) and transforms to a double salt of SnO2 and NaOH. Although additional well-focused studies will be required for confirmation, the experimental data in the highly alkaline region (0.003 to 3.5mol⋅dm−3 NaOH) can be well described with log 10 K 0 of −5.29±0.35 for the reaction Na2Sn(OH)6(s)⇄Na2Sn(OH)6(aq). Springer Science+Business Media, LLC, 2011 Solubility nationallicence Thermodynamic data nationallicence Tin nationallicence Tin hydroxide nationallicence Cassiterite nationallicence Hydrolysis constants of tin nationallicence SnO2(am) nationallicence Sn nationallicence Rai Dhanpat Rai Enviro-Chem, LLC, 1000 Hanley Drive, P.O. Box 784, 97498-0784, Yachats, OR, USA aut Yui Mikazu Japan Atomic Agency, Tokai-mura, Japan aut Schaef H. Pacific Northwest National Laboratory, Richland, WA, USA aut Kitamura Akira Japan Atomic Agency, Tokai-mura, Japan aut Journal of Solution Chemistry Springer US; http://www.springer-ny.com 40/7(2011-07-01), 1155-1172 0095-9782 40:7<1155 2011 40 10953 https://doi.org/10.1007/s10953-011-9723-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10953-011-9723-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rai Dhanpat Rai Enviro-Chem, LLC, 1000 Hanley Drive, P.O. Box 784, 97498-0784, Yachats, OR, USA aut NATIONALLICENCE 700 1- Yui Mikazu Japan Atomic Agency, Tokai-mura, Japan aut NATIONALLICENCE 700 1- Schaef H. Pacific Northwest National Laboratory, Richland, WA, USA aut NATIONALLICENCE 700 1- Kitamura Akira Japan Atomic Agency, Tokai-mura, Japan aut NATIONALLICENCE 773 0- Journal of Solution Chemistry Springer US; http://www.springer-ny.com 40/7(2011-07-01), 1155-1172 0095-9782 40:7<1155 2011 40 10953 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer