LIMITATIONS OF THE ARRHENIUS THEORY



LIMITATIONS OF THE ARRHENIUS THEORY

Arrhenius theory can easily explain the dissociation of weak electrolytes. However, when applied to strong electrolyte, some limitations are observed which are given below:

(i)                The degree of dissociation obtained from conductivity measurements is in
good agreement for weak electrolytes. But for the strong electrolytes, the agreement is very poor.

(ii)             The Ostwald’s dilution law is obeyed by weak electrolytes but not at all by
the strong electrolytes.

(iii) Arrhenius theory assumes the existence of ions but does not take into account the electrostatic attraction between ions. The effect of inter-ionic attractions is very small in solutions of weak electrolytes but in case of strong electrolytes, this effect is quite strong.

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