“…As was shown by Esteso et al [5], the approximation arising from the use of the same set of potentiometric data with the Extended DebyeeHückel Equation (DH), Pitzer model (P) and the so-called chemical model, made it possible to obtain g ± values that agree with themselves within 0.003. The difference among the values increases with increasing content of alcohol, apparently due to some association process.…”