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NEET2013ChemistryIonic EquilibriumActual

Accumulation of lactic acid ( HC ₃ H ₅ O ₃ ) , a monobasic acid in tissues leads to pain and a feeling of fatigue. In a 0.10 M aqueous solution, lactic acid is 3.7 % dissociates. The value of dissociation constant, K _a , for this acid will be:

Options

  1. A1.4 10⁻⁵
  2. B1.4 10⁻⁴
  3. C3.7 10⁻⁴
  4. D2.8 10⁻⁴

Correct answer

B. 1.4 10⁻⁴

Step-by-step solution

= 3.7 100 =0.037 According to Ostwald's formula aligned K _ & = ^2 C & =(0.037)^2 0.10 & =1.369 10⁻⁴ aligned

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