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Equivalent conductance of 0.1 M HA (weak acid) solution is 10 S c m 2 equivalent - 1 and that at infinite dilution is 200 S c m 2 equivalent - 1 . Hence pH of HA solution is

Options

  1. A1.3
  2. B1.7
  3. C2.3
  4. D3.7

Correct answer

C. 2.3

Step-by-step solution

α = Λ Λ ∞ = 10 200 = 1 20 [H + ] weak   acid   =   Cα = 0.1 × 1 20 = 5 × 1 0 - 3 p H = 3 - l o g 5 = 2 . 3

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