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This theory was presented by Arhenious in 1880 in which he explained behaviour of electrolytes.



Following are the postulates of Arhenious theory of ionization:

i. Electrolytes are those substance which consist of +ve and -ve ions and can conduct electricity in aqueous solution.


ii. Electrolyte dissociates into +ve and -ve ions when mixed with water.

NaCl <========> 2 Na+ + Cl-


iii. The no of +ve ion and -ve ion produced by any electrolyte are always same which means that electrolyte is a neutral substance.

iv. The process of dissociation of electrolyte into ions is a reversible process.


v. The ability of any electrolyte to conduct electricity from its solution depends upon its nature. Some electrolyte conduct electricity in large extent called strong electrolyte, while some electrolytes conduct electricity in small extent called weak electrolyte.


vi. The dissociation of any electrolyte into ions do not depend upon passage of electric current. On the passage of electricity only +ve and -ve ions of electrolyte are start moving toward cathode and anode respectively. This process is called electrolysis.

vii. The ability of an electrolyte to dissociate in to ion depends on.

a) Nature of electrolyte

b) Temperature

c) Degree of dilution


viii. The electrical conductivity of any electrolyte depends upon.

a) Number of ions

b) Velocity of ions examine right over here

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