The solubility of Ca(OH)2 in extremely concentrated NaOH solutions at 25°C
The solubility of Ca(OH)2 in extremely concentrated NaOH solutions at 25°C
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25°C 下 Ca(OH)2 在极浓 NaOH 溶液中的溶解度
DOI：
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发表时间：
2012
期刊：
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通讯作者：
P. Sipos
中科院分区：
文献类型：
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作者：
Attila Pallagi;A. Tasi;Attila Gácsi;Miklós Csáti;I. Pálinkó;G. Peintler;P. Sipos
[摘要]测定了Ca(OH)2在25℃下12.50 M的NaOH水溶液中的溶解度。将NaOH浓度低于3 M时得到的溶解度数据与文献中发表的数据进行了比较。随着NaOH浓度的增加，Ca(OH)2的溶解度逐渐降低。在恒定离子强度（I = 1 M Na(Cl，OH)）下得到的溶解度数据可以测定Ca(OH)2(s)的条件溶解度积（lgLCa(OH)2 =−4.10±0.02）。氢氧配合物CaOH+(aq)的形成被用来描述[Ca2+]T与[OH−]T的变化。其条件稳定常数为lgKCaOH+ = 0.97±0.02。所采用的实验方案被证明适用于在由高浓度碱性溶液和含有ppm范围内的分析物组成的快速平衡系统中精确的溶解度测定。
AbstractThe 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.