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  4. pKa of a weak acid (HA) and pKb of a weak base (BOH) are 3.2 and 3.4, respectively. .The pH of their salt (AB) solution is :

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Q. $pK_a$ of a weak acid (HA) and $pK_b$ of a weak base (BOH) are $3.2$ and $3.4,$ respectively. .The pH of their salt (AB) solution is :

JEE MainJEE Main 2017Equilibrium

Solution:

$pH=7+\frac{1}{2}\left(pK_{a}-pK_{b}\right)$

$=7+\frac{1}{2}\left(3.2-3.4\right)$

$=6.9$