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COMEDK2023ChemistryIonic Equilibrium

In a 0.2 M aqueous solution, lactic acid is 6.9 % dissociated. The value of dissociation constant is

Options

  1. A1.2 10⁻⁴
  2. B95 10⁻⁴
  3. C6.5 10⁻⁴
  4. D3.6 10⁻²

Correct answer

B. 95 10⁻⁴

Step-by-step solution

Given, =6.9 % Degree of dissociation, = 6.9 100 =0.069 According to ostwald's dilution law, aligned & K_a= ^2 C=(0.069)^2 0.2 & K_a=9.5 10⁻⁴ aligned

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