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

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 concentratio...

Full description

Saved in:
Bibliographic Details
Published in:Central European journal of chemistry 2012-04, Vol.10 (2), p.332-337
Main Authors: Pallagi, Attila, Tasi, Ágost, Gácsi, Attila, Csáti, Miklós, Pálinkó, István, Peintler, Gábor, Sipos, Pál
Format: Article
Language:English
Subjects:
Aqueous solutions
Biochemistry
Biological and Medical Physics
Biophysics
Ca(OH)2
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Concentrated electrolytes
Geochemistry
ICP AES
Research Article
Solubility
Solubility apparatus
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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) (lgL Ca(OH)2 = − 4.10 ± 0.02). Formation of the hydroxo complex CaOH + (aq) was invoked to describe the variation of [Ca 2+ ] T with [OH − ] T . Its conditional stability constant was found to be lgK CaOH+ = 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.
ISSN:1895-1066
2391-5420
1644-3624
2391-5420
DOI:10.2478/s11532-011-0145-0