Interfaces Reversible with Respect to Single Ions

3 Interfaces Reversible with Respect to Single Ions 

The interface between w and s containing electrolytes of the MX and MX2 type, respectively, and represented in the form  

It is obvious from the above conditions that the transfer of strongly hydrophilic Xj anions from phase w to s and of strongly hydrophobic X J anions from phase s to w is much more difficult compared to the transfer of the common hydrophihc-hydrophobic M cations. In the equihbrium state, the Galvani potential is defined in terms of the Nernst equation [see Eqs. (4, 7, 15, and 16)]  

When the concentration of ions the same in both phases of system VIII, the interface is characterized by the formal Galvani potential of the ions, i.e. by the equation  

Equations (32) and (33) have been known and used for a long time, both as special relations describing Haber s ion-selective systems (Sect. 2.2) and modern investigations of the interfaces of immiscible electrolyte solutions. 

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