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The paper discusses the limits of applicability of the most common approximate formulae employed for calculating the [H30+] value of aqueous solutions containing a weak electrolyte whose acid-base behaviour is completely described by a single ionization process. These limits are so fixed as to avoid that absurd results are obtained. In addition, a new simple formula is proposed, that overcomes some drawbacks of the traditional formulae, and an unknown, singular feature of a well-known formula is pointed out.

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The limitations as well as the conditions under which this simplified approach to the hydrolysis of salts from a weak acid and a weak base can yield almost exact results are discussed.