Abstract
The ion exchange behaviour of alkali metal ions on synthetic zeolite 4 A in the water-methanol system has been studied as a function of D, the macroscopic dielectric constant of the external solution. The anomalous behaviour of Li + in the presence of organic solvent is observed. Applying a statistical-thermodynamic treatment, thermodynamic equilibrium constants are determined; from these the standard free energies of exchange are evaluated for the systems Na + ↔ M + ( M + = Li +, K +, Rb +and Cs +) in a 50 mole % water-methanol mixture. The thermodynamic affinity sequence, based on the standard free energies of exchange, is Na + > K + > Rb + > Cs + > Li +.
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