Equilibrium Ques 87
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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Answer:
Correct Answer: 87.(d)
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 $HB$
$pH=p K_a+\log 1$
$pH=p K_a=4$
BETA
