Chemistry

Arrhenius Theory of Ionization

The main postulates of Arrhenius Theory of Ionization are:

  1. Electrolytes contain electrically charged particles called ions.
  2. Electrolytes dissociate into the oppositely charged ions in water.
  3. The number of positive and negative charges on ions must be equal.
  4. Ionization is a reversible process in the solution contain ionized and un-ionized electrolytes molecules.
  5. The degree of the ionization depends upon the nature of electrolyte. Strong electrolyte (NaCl) ionize completely while the weak electrolytes (CH3COOH) ionize incompletely.
  6. On passing the electric current, cation moves towards cathode while anions move towards the anode.
  7. Dissociation of the electrolytes depends upon (i) Nature of electrolyte (ii) Degree of dilution (iii) Temperature.
  8. Electrical conductivity depends upon the (i) Number of Ions present in the solution (ii) Speed of ions.

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