THE THEORY OF ACIDS AND BASES - Royal Society of …
THE THEORY OF ACIDS AND BASES
By F. M. HALL, )1.SC. Wollongong University College, N.S. W. , Australia
The theory of acids and bases, like many other chemical theories, has undergone numerous changes in recent times. Always the changes have been such as to make the theory more general. The three main theories in use today are:
(l ) the Water or Arrhenius Theory;
and the term hydrolysis relates to the interaction of the ions of the salt with water to give (a) a weak acid or a weak base, or (b) a weak acid and a weak base.
Applying the Law of l\llass Action to such a system, the hych?olysis constant, at equilibrium, may be written as
(2) the Proton or Br0nsted- Lowr.v Theory;
(3) the Electronic or Lewis Theory.
WATEl~ OR AlmHENIUS 'l'HEORY
The Water or Arrhenius Theory was
l
[Base] [Acid]
[OH-) [HA)
(" = (Unhydrolysed salt] =
[A- ]
and if x is the extent to which hydr olysis occurs and c is the molar concentration of salt in solution
widely accepted up to the early years of this century . It defines an acid as a hydrogen compound ionizing in water to give hydrogen ions, and a base as a hy ................
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