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JEE Main202528 Jan 2025Morning ShiftChemistryIonic EquilibriumActual

A weak acid HA has degree of dissociation x . Which option gives the correct expression of ( pH pK _ a )?

Options

  1. A0
  2. B(1+2 x )
  3. C( 1-x x )
  4. D( x 1-x )

Correct answer

D. ( x 1-x )

Step-by-step solution

aligned & K _ a = [ H ⁺ ]( x ) C (1- x ) & [ H ⁺ ]= K _ a (1- x ) x & H ⁺= K _ a + ( 1- x x ) & - H ⁺=- K _ a - 1- x x & pH = pK _ a - 1- x x & pH - pK _ a = x 1- x aligned

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