Arrhenius Theory of Ionization

In 1887, Arrhenius put forwarded a theory to explain the properties of electrolysis of solution.

Postulates of Arrhenius theory of ionization:

  1. When an electrolyte is dissolved in water, it dissociates into oppositely charged particles called ions and the process is called ionization.
  2. The positively charged ions are called cations and the negatively charged ions are called anions.
  3. The total positive charge present in the cations is equal to the total negative charge in anions. So, the electrolytic solution is electrically neutral.
  4. If electricity is passed through the electrolytic solution, cations moves towards the cathode and anions move towards anode. This is the reason for the electrical conductivity of electrolytic solution.
  5. The ions given by the electrolyte have tendency to reunite to form undissociated molecule thereby establishing an equilibrium between ions and undissociated molecules called the ionic equilibrium.
  6. The ionization is an incomplete process and the extent of ionization is measured in terms of degree of ionization.

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One Response to “Arrhenius Theory of Ionization”

  1. komal a.A. wadi

    arrhenius theory introduced in 1887by the swendish he is good person because student are study very interstfully in my toution