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How can the value of the dissociation constant (K a ) be determined for a weak electrolyte like acetic acid?

Options

  1. ABy measuring the concentration of acetic acid
  2. BBy measuring the conductivity at high concentrations
  3. CBy using the equation K a = C⍺ / ⍺
  4. DBy using the equation K a = CΛ m 2 / Λ° m (Λ° m - Λ m )

Correct answer

D. By using the equation K a = CΛ m 2 / Λ° m (Λ° m - Λ m )

Step-by-step solution

For a weak electrolyte like acetic acid, K a = C⍺2 /(1- ⍺) =K a = CΛ m 2 / Λ° m 2(1 - Λ m /Λ° m ) = K a = CΛ m 2 / Λ° m (Λ° m - Λ m ) .

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