Potentiometric Titration, Association Phenomena, and Interaction of Neighboring Groups in Polyelectrolytes

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Abstract
The partition functions and potentiometric titration equations are calculated for a number of types of polyelectrolytes, including polyampholytes and other electrolytic copolymers. The effects of the interaction between neighboring groups and of the electrostatic potential of the macromolecule as a whole are both accounted for independently, by treating the ionized macromolecule as a separate phase in equilibrium with the surrounding solution. The possibility of association of monovalent cations with the acidic groups of polyacids is discussed, following the derivation of the titration equations for both the H+ ion and the associating metallic cation.