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

• Authors: Attila Pallagi , Ágost Tasi , Attila Gácsi , Miklós Csáti , István Pálinkó , Gábor Peintler , Pál Sipos
• Languages of publication: EN

Abstracts

EN

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. [...]

Keywords

EN

Solubility apparatus; Solubility; ICP AES; Ca(OH)2 ; Concentrated electrolytes; Aqueous solutions

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2012
• Volume: 10
• Issue: 2
• Pages: 332-337

Dates

published

1 - 4 - 2012

online

29 - 1 - 2012

Contributors

author

Attila Pallagi

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

author

Ágost Tasi

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

author

Attila Gácsi

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

author

Miklós Csáti

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

author

István Pálinkó

• Department of Organic Chemistry, University of Szeged, H-6720, Szeged, Hungary

author

Gábor Peintler

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

author

Pál Sipos

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

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Identifiers

DOI

10.2478/s11532-011-0145-0