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Basic Buffer Action

A certain buf...

Question

A certain buffer solution contains equal concentrations of $B^{+}$ & $B O H$ . If the $K_{b}$ of $B O H$ is $10^{- 10}$ . The $p H$ of buffer is:

A

14

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B

4

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C

10

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D

7

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Solution

The correct option is A $4$
The expression for the $p O H$ of the basic buffer solution is as given below.

$p O H = p K_{b} + l o g \frac{[s a l t]}{[b a s e]}$

But when $[s a l t] = [b a s e]$ , the equation becomes $p O H = p K_{b}$ .

$p K_{b} = - l o g K_{b} = - l o g (10^{- 10}) = 10$

Hence, $p O H = 10$
$p H = 14 - p O H = 14 - 10 = 4$ .

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