Solubilities of H2 in H2O and D2 in D2O with dissolved boric acid and lithium hydroxide

2006 ◽  
Vol 84 (1) ◽  
pp. 65-68 ◽  
Author(s):  
Uncharat Setthanan ◽  
David R Morris ◽  
Derek H Lister
Keyword(s):  
Boric Acid ◽  
Heavy Water ◽  
Aqueous Electrolyte ◽  
Pure Water ◽  
Electrolyte Solutions ◽  
Lithium Hydroxide ◽  
Hydrogen Solubility ◽  
Salting Out ◽  
Temperature Changes ◽  
Specific Parameter

The solubilities of hydrogen (H2 and D2) in aqueous (H2O and D2O) solutions of lithium hydroxide or boric acid have been measured in the temperature range 25–80 °C. Lithium hydroxide and boric acid cause a salting-out effect for H2 and D2. The solubilities of H2 and D2 in aqueous electrolyte solutions exhibit similar responses to temperature changes as those for pure water. The solute specific parameter (hi) for boric acid in light and heavy water is 0.07 ± 0.02 and 0.48 ± 0.26 m3 kmol–1, respectively.Key words: hydrogen solubility, deuterium solubility, salting-out effect.

Compressibilities of aqueous electrolyte solutions

1981 ◽  
Vol 34 (9) ◽  
pp. 1785 ◽  
Author(s):  
JV Leyendekkers
Keyword(s):  
Aqueous Electrolyte ◽  
Pure Water ◽  
Electrolyte Solutions ◽  
Partial Molal Volume ◽  
Molal Volume ◽  
Aqueous Electrolyte Solutions ◽  
The Difference ◽  
Experimental Values ◽  
Apparent Molal Compressibility ◽  
Reorientation Motion

The Tammann-Tait-Gibson (TTG) model was used to derive and analyse an equation for the isothermal compressibility of aqueous electrolyte solutions as a function of temperature and pressure. The linear equation of Φk in c½ (Φk is the apparent molal compressibility, c is in mol 1-1) is shown to be inadequate. The best function in the square-root of the concentration [either in (mol kg-1) or c] is degree three. This gives the correct limiting slope predicted by the TTG model, viz., Sv/(BT + 1), where S, is the Masson slope for apparent molal volumes and BT is the Tait parameter for pure water. This slope was verified previously by comparison with the limiting slope obtained experi- mentally, and can be predicted from the standard ionic entropies. The difference in the TTG slope and the Debye-Hiickel point-charge slope is proportional to changes in the reorientation motion of water molecules close to the ionic surface. The electrostriction component, Vcelect, of the limiting partial molal volume is equal to - K°(BT+ 1), where K° is the limiting partial molal compressibility. Values of V°elect calculated from this relationship are compared with values from other models. The TTG model was used to derive internal pressure functions which could be used to analyse deviations of V°elect from the NIH (non-interacting homomorph) model. The TTG equations were used to calculate the isothermal compressibilities of 15 electrolytes. The agreement with experimental values is good (deviations are less than 0.1 × 10-6cm3 g-1 bar-1 for βv for the most reliable data). Values of Φk at 200 bar were calculated also and are in good agreement with the corresponding experimental values.

scholarly journals Solubility of Rare Earth Chlorides in Ternary Water-Salt Systems in the Presence of a Fullerenol—C60(OH)24 Nanoclusters at 25 °C. Models of Nonelectrolyte Solubility in Electrolyte Solutions

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 349
Author(s):  
Nikolay A. Charykov ◽  
Viktor A. Keskinov ◽  
Kirill A. Tsvetkov ◽  
Ayat Kanbar ◽  
Konstantin N. Semenov ◽  
...  
Keyword(s):  
Rare Earth ◽  
Pure Water ◽  
Pitzer Model ◽  
Ternary Systems ◽  
Electrolyte Solutions ◽  
Water Soluble ◽  
Salting Out ◽  
Isothermal Saturation ◽  
Water Salt ◽  
Salt Systems

The solubility in triple water-salt systems containing NdCl3, PrCl3, YCl3, TbCl3 chlorides, and water-soluble fullerenol C60(OH)24 at 25 °C was studied by isothermal saturation in ampoules. The analysis for the content of rare earth elements was carried out by atomic absorption spectroscopy, for the content of fullerenol—by electronic spectrophotometry. The solubility diagrams in all four ternary systems are simple eutonic, both consisting of two branches, corresponding to the crystallization of fullerenol crystal-hydrate and rare earth chloride crystal-hydrates, and containing one nonvariant point corresponding to the saturation of both solid phases. On the long branches of C60(OH)24*18H2O crystallization, a C60(OH)24 decreases by more than 2 orders of magnitude compared to the solubility of fullerenol in pure water (salting-out effect). On very short branches of crystallization of NdCl3*6H2O, PrCl3*7H2O, YCl3*6H2O, and TbCl3*6H2O, the salting-in effect is clearly observed, and the solubility of all four chlorides increases markedly. The four diagrams cannot be correctly approximated by the simple one-term Sechenov equation (SE-1), and very accurately approximated by the three-term modified Sechenov equation (SEM-3). Both equations for the calculation of nonelectrolyte solubility in electrolyte solutions (SE-1 and SEM-3 models) are obtained, using Pitzer model of virial decomposition of excess Gibbs energy of electrolyte solution. It is shown that semi-empirical equations of SE-1 and SEM-3 models may be extended to the systems with crystallization of crystal-solvates.

Investigation and prediction of the salting-out effect of methane in various aqueous electrolyte solutions

2016 ◽  
Vol 34 ◽  
pp. 117-121 ◽  
Author(s):  
Kwangmin Kim ◽  
Kyeongjun Seo ◽  
Jaewon Lee ◽  
Myung-Gil Kim ◽  
Kyoung-Su Ha ◽  
...  
Keyword(s):  
Aqueous Electrolyte ◽  
Electrolyte Solutions ◽  
Salting Out ◽  
Aqueous Electrolyte Solutions

Salting-in/Salting-out Mechanism of Carbon Dioxide in Aqueous Electrolyte Solutions

2017 ◽  
Vol 30 (6) ◽  
pp. 811-816 ◽  
Author(s):  
Xia Zhang ◽  
Lu Zhang ◽  
Tan Jin ◽  
Zhi-jun Pan ◽  
Zhe-ning Chen ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Aqueous Electrolyte ◽  
Electrolyte Solutions ◽  
Salting Out ◽  
Aqueous Electrolyte Solutions
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