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NTA Abhyas NEET2020ChemistryIonic EquilibriumPractice

A certain weak acid has a dissociation constant 10 × 10 − 4 . The equilibrium constant for its reaction with a strong base is:

Options

  1. A1 . 0 × 1 0 - 4
  2. B1 . 0 × 1 0 - 10
  3. C1 . 0 × 1 0 - 14
  4. D1 × 1 0 10

Correct answer

D. 1 × 1 0 10

Step-by-step solution

HA + aq ⇌ H aq + + A - aq K a = H + A - HA Also HA + B + + OH - ⇄ B + + H 2 O + A - HA + OH - ⇌ H 2 O + A - K eq = A - HA OH - = A - H + HA OH - H + = K a K w ⁡ ∴ K eq = K a K w = 10 − 4 10 − 14 = 10 10

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