Abstract
A simplified model of the titration curve of weak polyacids is presented, based on a combination of limiting law expressions for the extent of counterion binding and a nearest-neighbor model for interactions among titrated sites on the polyion. Expressions are derived for the intrinsic acid dissociation constant and the nearest-neighbor anticooperativity that can be related to experimental data in the middle of the titration curve, a region readily accessible by experiment, so avoiding extrapolation of the titration curve into regions where data are hard to collect or where errors are magnified. The shape and salt dependence of the titration curve are quantitatively predicted very simply in our model
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