Silver ion in methanol was exchanged with sodium ion using Dowex 50 cross-linked with 8% divinyl benzene by Gable and Stroebel [J. Phys. Chem., 60, 513-517 (1956)]. The molar selectivity coefficient was found to vary somewhat with the equivalent fraction of Na+ in the resin as follows:

If the wet capacity of the resin is 2.5 eq/L and the resin is initially saturated with N+, calculate the equilibrium equivalent fractions if 50 L of 0.05-M Ag+ in methanol is treated with 1 L of wet resin.

0.1 XNa+ 0.3 0.5 12.3 0.7 0.9 K KAg+,Na+ 11.2 11.9 14.1 17.0