Concentration Dependence of Ionic Hydration Numbers

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• 作者：Yizhak Marcus
• 刊名：Journal of Physical Chemistry B
• 出版年：2014
• 出版时间：September 4, 2014
• 年：2014
• 卷：118
• 期：35
• 页码：10471-10476
• 全文大小：237K
• ISSN：1520-5207

文摘

Isothermal compressibility data of 23 aqueous electrolyte solutions at 25 掳C from the literature are used to calculate their hydration numbers, which diminish as the concentration increases. Their limit at very high concentration is near the 鈥渘umber of adsorption sites鈥?of water molecules on the ions, obtained by the BET method. On the contrary, hydration numbers obtained from ultrasound speed measurements yielding isentropic compressibilities cannot be valid, being much too large at infinite dilution.