The statistical check of Davies’s equations for calculation of ionic activity coefficients were realized by the comparison of experimental ionic activity coefficients values with those caculated using Davies’s equations. Obtained results showed that at I for 55% examined cases the difference in the experimental values of lgfi with those calculated from Davies’s equations with parameters and is negligible (with the level of significance). At I > in general, the results are very disperced and in many cases there are the large deviation between the experimental and the calculated values. Here we cannot conclude that the equation with parameter is better than the old equation with parameter.
