Chemistry · EQUILIBRIUM
हिन्दीFor a conjugate acid-base pair in water, which of the following expressions correctly represents the relationship between their dissociation constants at any temperature \( T \)?
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 \( pK_a + pK_b = pK_w \).