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BY-NC-ND 3.0 license Open Access Published by De Gruyter Open Access January 29, 2012

The solubility of Ca(OH)2 in extremely concentrated NaOH solutions at 25°C

  • Attila Pallagi EMAIL logo , Ágost Tasi , Attila Gácsi , Miklós Csáti , István Pálinkó , Gábor Peintler and Pál Sipos
From the journal Open Chemistry

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.

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Published Online: 2012-1-29
Published in Print: 2012-4-1

© 2012 Versita Warsaw

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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