Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Free Energy of Ion Hydration

  • Kim, Hag-Sung (Department of Chemistry, Kyungpook National University) ;
  • Chung, Jong-Jae (Department of Chemistry, Kyungpook National University)
  • Published : 1993.04.20
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Abstract

The influence of temperature and pressure on the free energy of the ion hydration has been considered. The ion radii measured by conductometric method and the saturated dielectric constant cited from other works were used to calculate the free energy in the hydration shell. The Born equation was modified in order to fit in our model. In our model, the environment of ion consists of three regions. The innermost one is the hydration shell in which water is immobilized and electrostricted, the middle one is the one which contains less ordered waters than the bulk medium, and the outermost one is the bulk water which is under the influence of the electric field of ion. Our results for the free energy of ion hydration were compared with those of other attempts. Especially, ${\Delta}$G$_{hyd}$ of $Li^+$ ion is considerably too negative in this study at given temperature, comparing with those of other attempts. But ${\Delta}$G$_{hyd}$ of other ions coincides with each other.

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