Numerical technique to correct for weak acid errors in gran function analysis of titration data

Ordinary Gran function analysis of titration data from samples which contain weak acids results in overestimates of strong acid acidity and underestimates of weak acid acidity. A numerical technique is developed which solves a general acid-base model from titration data. The technique is an iterative procedure which adjusts Gran functions for the effect of the weak acid components. The model and the method are validated with simulated titration data and laboratory data from test solutions.