Equilibrium - Result Question 83
####87. In a buffer solution containing equal concentration of $B^{-}$and $HB$, the $K_b$ for $B^{-}$ is $10^{-10}$. The $pH$ of buffer solution is : [2010]
(a) 10
(b) 7
(c) 6
(d) 4
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Solution:
- (d) $K_b=10^{-10} ; K_a=10^{-4}$ or $p K_a=4$
For the buffer solution containing equal concentration of $B^{-}$and $HB$
$pH=p K_a+\log 1$
$pH=p K_a=4$