An empirical relation between the limiting ionic molar conductivities and self-diffusion coefficients of pure solvents
Abstract
The limiting ionic molar conductivity (λ∞) of an electrolyte solution depends on the self-diffusion coefficient (Ds) of the pure solvent when the temperature (T) changes. To study the Ds-dependence of λ∞, we proposed a new empirical relation λ∞ ∝(Ds / T) t , with a parameter t. The relation is applied to the λ∞ and Ds of alkali, tetra-alkyl ammonium, and halogen ions in water or methanol. All ions except for tetra-alkyl ammonium ions in water exhibit excellent linear relationships in their λ∞ ∝(Ds / T) t plots, with t in the range from 0.88 to 1.26. This is the first report showing an affirmative linear correlation between λ∞ and Ds.
- Publication:
-
Chemical Physics Letters
- Pub Date:
- May 2018
- DOI:
- 10.1016/j.cplett.2018.03.063
- Bibcode:
- 2018CPL...699..162M
- Keywords:
-
- Limiting molar conductivity;
- Self-diffusion coefficient;
- Water;
- Methanol