Examples of the Gibbs-Donnan factors for non-ideal solutions separated by an ideal cation exchange membrane.

The Table presents the Gibbs–Donnan factors (DF1,21 and DF2,21) and the coefficients describing the equilibrium across an ideal cation exchange membrane obtained by solving Eqs (25), (26) and (32) for l2 = w for three different sets of concentrations of permeating ions (counter-ions) in compartment 1 and non-permeating ions (co-ions) in both compartments. The assumed values of A and D were 1.172 (L/mol)1/2 and 1.5 (L/mol)1/2, respectively [23]. The considered system includes two types of permeating cations: monovalent (z1 = 1) with concentration c1,1 in compartment 1 and bivalent (z2 = 2) with concentration c2,1 in compartment 1, and one type of monovalent non-permeating anion (Znp = -1) with concentration Cnp,1 in compartment 1 and Cnp,2 in compartment 2.