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Chemistry · EQUILIBRIUM

हिन्दी

For a conjugate acid-base pair in water, which of the following expressions correctly represents the relationship between their dissociation constants at any temperature \( T \)?

  1. \( pK_a - pK_b = pK_w \)
  2. \( K_a / K_b = K_w \)
  3. \( pK_a + pK_b = pK_w \)
  4. \( K_a + K_b = K_w \)

Correct answer · Option 3

\( pK_a + pK_b = pK_w \)

Explanation

Since the net reaction of an acid and its conjugate base dissociations is \( 2\text{H}_2\text{O} \rightleftharpoons \text{H}_3\text{O}^+ + \text{OH}^- \), \( K_a \times K_b = K_w \). Taking negative logarithm on both sides gives \( pK_a + pK_b = pK_w \).
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