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Common Ion Effect

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Estimated time: 3 minutes
Maharashtra State Board: Class 12

Key Points: Common Ion Effect

Ionisation of a weak electrolyte is suppressed when a strong electrolyte with a common ion is added. According to Le Chatelier’s Principle, equilibrium shifts left due to increased concentration of a common ion.

Example 1 (Weak Acid):

  • Reaction:
    CH₃COOH ⇌ H⁺ + CH₃COO⁻
  • Add: CH₃COONa (gives CH₃COO⁻)
  • Effect: Ionisation of CH₃COOH decreases

Example 2 (Weak Base):

  • Reaction:
    NH₄OH ⇌ NH₄⁺ + OH⁻
  • Add: NH₄Cl (gives NH₄⁺)
  • Effect: Ionisation of NH₄OH decreases
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