AI Article Synopsis
- The study investigates the standard partial molar volumes of 10 univalent and 5 divalent ions in water between 0-100 degrees Celsius, factoring in the effects of electrostriction and the volume of disordered water.
- Electrostrictive volumes are calculated using a model that considers the relationship between water's relative permittivity and the electrical field strength around each ion.
- The results provide insights into the spatial extent of the dielectrically saturated region around ions and lead to estimates of hydration numbers based on the average molar electrostriction in the water.
Article Abstract
The standard partial molar volumes of 10 univalent and 5 divalent ions in water over the temperature range of its existence as a liquid at ambient pressure (0-100 degrees C) are fitted as the sum of their (negative) electrostrictive volumes and intrinsic volumes, including disordered water. The former are obtained from the shell-by-shell calculation of the electrostriction according to Marcus and Hefter that takes into account the mutual dependence of the relative permittivity and the electrical field strength of the water around the ion. This calculation yields also the spatial extension of the dielectrically saturated region around the ions. The average molar electrostriction of the water in the vicinity of the ions is also calculated and leads to estimated hydration numbers.
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| http://dx.doi.org/10.1021/jp9027244 | DOI Listing |
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