ChemistryThe correct expression for Ostwald’s dilution law for a solution of weak electrolyte is

The correct expression for Ostwald’s dilution law for a solution of weak electrolyte is

  1. A

    Ka=α2(1-α)V

  2. B

    Ka=α2.V

  3. C

    Ka=α21-V

  4. D

    Ka=α2C(1-α)

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    Solution:

    Ostwald's law of dilution relates with the dissociation constant of a weak electrolyte to the degree of dissociation and the concentration of the weak electrolyte.

    Consider the following reaction,

                                     CH3COOHCH3COO-+H+

                                        Ka=[CH3COO-][H+][CH3COOH]

                                       Ka=αC.αC(1-α)C

                                       Ka=α2(1-α)V, Where C=1V

    Hence, the correct answer is option (A)Ka=α2(1-α)V.

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