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Calculate dissociation constant for an acid HA having [ H + ] equals to 0 .1 M (Given: degree of dissociation of HA is 1% )

Options

  1. A1 0 -8
  2. B1 0 -6
  3. C1 0 -3
  4. D1 0 -7

Correct answer

C. 1 0 -3

Step-by-step solution

k a = α 2 C 1 - α , α is very small ; ∴ 1 - α ≈ 1 Cα = 0 .1 k a = (Cα)α = 0.01 × 0.1 = 10 − 3

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