title: Thermodynamic properties of polyelectrolyte solutions containing mixtures of monovalent and trivalent counterions.
abstract: The osmotic coefficients, heats of dilution, and volume changes on dilution of aqueous solutions containing mixtures of polystyrenesulfonic acid and its lanthanum salt have been determined at 25 degrees C. The curve representing the osmotic coefficient as a function of the equivalent fraction of the acid has a maximum; the corresponding curves for the enthalpy and volume changes on dilution have a sigmoidal shape. Experimental results have been compared with predictions of the theory based on the cell model with cylindrical symmetry. A semiquantitative agreement between theory and experiment has been found.
mesh_terms: D004573:Electrolytes; D007811:Lanthanum; D008433:Mathematics; D011137:Polystyrenes; D012492:Salts; D012996:Solutions; D013451:Sulfonic Acids; D013816:Thermodynamics
chemical_list: D004573:Electrolytes; D011137:Polystyrenes; D012492:Salts; D012996:Solutions; D013451:Sulfonic Acids; D007811:Lanthanum