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99 Percentile Qs Bank for JEE MainChemistryIonic Equilibrium

A certain weak acid has a dissociation constant of 1.0 × 1 0 - 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 10
  4. D1.0 × 1 0 14

Correct answer

C. 1.0 × 1 0 10

Step-by-step solution

HX ⇌ H + + X - K a = 1 0 - 4 = H + X - HX .....(i) HX + NaOH ⇌ NaX + H 2 O K eq = Na + X - HX Na + OH - = X - HX OH - .....(ii) By Eqns. (i) and (ii) K eq K a = 1 K w ∴ K eq = K a K w = 1 0 - 4 1 0 - 1 4 = 1 0 1 0

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