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NEET2023ChemistryIonic EquilibriumActual

For a weak acid HA , the percentage of dissociation is nearly 1 % at equilibrium. If the concentration of acid is 0.1 ~mol ~L ⁻¹ , then the correct option for its K _ a at the same temperature is

Options

  1. A1 10⁻⁵
  2. B1 10⁻³
  3. C1 10⁻⁴
  4. D1 10⁻⁶

Correct answer

A. 1 10⁻⁵

Step-by-step solution

aligned & HA H ⁺+ A ⁻ & At t =0 C - & At eq. C - C C C & K = [ H ⁺ ] [ A ⁻ ] [ HA ] = ( C )( C ) C (1- ) = C ^2 1- = C ^2 ( is very small ) & =0.1(0.01)^2=1 10⁻⁵ & aligned

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