Das Potential in der Umgebung einer lonenladung in wässerigen Elektrolytlösungen

Abstract

The exchange of a proton (or of the ion CH₃Hg⁺) between two donors differing by an electric charge only (Fig. 1, 2) is governed exclusively by electrostatic forces, and ΔG of such a process gives some experimental information on the effective dielectric constant ε_e to be used in considering the interaction of ions in solution. The enthalpy change ΔH of the proton transfer process on the other hand is dependent not only on ε_e, but also on ∂ε_e/∂T. The results (Fig. 3 and 4) explain the fact that ion association due to electrostatic forces (hard donors and acceptors) are entropy controlled mainly.