Gibb's Hydration Free Energy of Univalent Ions Using Van der Waals Radius of Ion in Water obtained using Conductometric Method
- Gibb's Hydration Free Energy of Univalent Ions Using Van der Waals Radius of Ion in Water obtained using Conductometric Method
- Kim, Hag Sung
- Issue Date
- No. 1
- The effect of temperature and pressure on the free energy of ion hydration has been reconsidered. The van der Waals radii of ions have been calculated using Stokes radii of ions obtained by conductometric method and the saturated dielectric constant cited from other works were used to calculate the free energy of ions in the hydration shell. The Born equation was modified in order to fit in our model deduced from the comparison of hydration numbers among studies. 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, ΔG_(h) of Li^(+) ion is considerably too negative in this study at a given temperature, comparing with those of other attempts. But ΔG_(h) of other ions coincides with each other. And, ΔG_(h) of this study is smaller than that obtained using the Nightingale method.
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