A, Impermeant anions (A−) were placed in one compartment with K+, NaCl salt was placed in the other compartment. B, Conditions after salt dissociation and ionic redistribution. C, Concentrations obtained after x, y, and z have been solved. D, Example of resulting osmolality differential between the two compartments after ionic redistribution when 150 mM NaCl and KA salts were placed in their respective compartments.