Studies of polyelectrolyte solutions containing mixtures of mono- and divalent counterions. II. Heat of dilution

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Abstract
The heats of dilution of aqueous solutions containing mixtures of polystyrenesulfonic acid and its magnesium salt have been measured at 25°C in the concentration range 0.1–0.001M. From these data the enthalpy difference between two concentrations has been obtained as a function of the equivalent fraction of the acid. The curve representing this function has a sigmoidal shape. On the basis of the cell model with cylindrical symmetry, the electrostatic contribution to the enthalpy of the polyelectrolyte solution containing a mixture of mono‐ and divalent counterions has been calculated. A reasonable agreement between theory and experiment has been found.

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