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:

  1. (d) $K_b=10^{-10} ; K_a=10^{-4}$ or $p K_a=4$

For the buffer solution containing equal concentration of $B^{-}$and $HB$

$pH=p K_a+\log 1$

$pH=p K_a=4$



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