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NTA Abhyas NEET2020ChemistryIonic EquilibriumPractice

If C the concentration of a weak electrolyte, α is the degree of ionization and K a is the acid ionization constant, then the correct relationship between α , C and K a is

Options

  1. Aα 2 = K a C
  2. Bα 2 = C K a
  3. Cα = C K a
  4. Dα = K a C

Correct answer

D. α = K a C

Step-by-step solution

According to the Ostwald’s dilution formula α 2 = K ( 1 - α ) C . But for weak electrolytes α is very small. So that ( 1 - α ) can be neglected. So that α = K a C .

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