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

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Central European Journal of 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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Authors and Affiliations

  1. Department of Inorganic and Analytical Chemistry, University of Szeged, Szeged, H-6701, P.O. Box 440, Hungary

    Attila Pallagi, Ágost Tasi, Attila Gácsi & Pál Sipos

  2. Inspectorate for Environment, Nature Conservation and Water in the Region of Lower Tisza, H-6721, Szeged, Hungary

    Miklós Csáti

  3. Department of Organic Chemistry, University of Szeged, H-6720, Szeged, Hungary

    István Pálinkó

  4. Department of Physical Chemistry and Materials Science, University of Szeged, Szeged, H-6720, Hungary

    Gábor Peintler

Authors
  1. Attila Pallagi
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  2. Ágost Tasi
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  3. Attila Gácsi
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  4. Miklós Csáti
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  5. István Pálinkó
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  6. Gábor Peintler
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  7. Pál Sipos
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Correspondence to Pál Sipos.

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Pallagi, A., Tasi, Á., Gácsi, A. et al. The solubility of Ca(OH)2 in extremely concentrated NaOH solutions at 25°C. cent.eur.j.chem. 10, 332–337 (2012). https://doi.org/10.2478/s11532-011-0145-0

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  • DOI: https://doi.org/10.2478/s11532-011-0145-0

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