1. The solubility of Ca(OH)2 in extremely concentrated NaOH solutions at 25°C
- Author
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Attila Gácsi, István Pálinkó, Pál Sipos, Miklós Csáti, Attila Pallagi, Ágost Gyula Tasi, and Gábor Peintler
- Subjects
aqueous solutions ,Aqueous solution ,Conditional stability ,Chemistry ,solubility ,Inorganic chemistry ,concentrated electrolytes ,General Chemistry ,Solubility equilibrium ,ca(oh)2 ,Molar solubility ,Ionic strength ,Inductively coupled plasma atomic emission spectroscopy ,icp aes ,Materials Chemistry ,solubility apparatus ,Solubility ,QD1-999 - Abstract
The solubility of Ca(OH)2 in aqueous NaOH solutions up to 12.50 M at 25°C has been determined. The solubility data obtained for NaOH concentrations lower than 3 M was compared with those published in the literature. The solubility of Ca(OH)2 steadily decreases with the increasing NaOH concentration. The solubility data obtained at a constant ionic strength (I = 1 M Na(Cl,OH)) enabled the determination of the conditional solubility product of Ca(OH)2(s) (lgLCa(OH)2 = − 4.10 ± 0.02). Formation of the hydroxo complex CaOH+(aq) was invoked to describe the variation of [Ca2+]T with [OH−]T. Its conditional stability constant was found to be lgKCaOH+ = 0.97 ± 0.02. The experimental protocol employed was proven to be suitable for accurate solubility determinations in rapidly equilibrating systems comprising of highly concentrated, alkaline solutions and containing analytes in the ppm range.
- Published
- 2012