On the use of dimensionless parameters in acid‐base theory VII. The pH of solutions of salts of a strong acid and a weak base or vice versa

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Abstract
The equation for the hydrogen ion activity in solutions of salts of a strong acid and a weak base, or vice versa, is of the thírd degree. Nevertheless, explicit equations for pH of such solutions can be formulated as linear functions of the logarithm of the salt concentration. The equations are valid within the major parts of pH and concentration intervals of experimental interest. The ranges of validity are given in terms of mathematically defined pH intervals. Close relations with pH of free base or free acid solutions of the same concentration as the salt are demonstrated. For instance, the pH difference between solutions of the salt and the free base or acid having unit activities is ± 7 pH units.