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pH of Acids and Bases

pH of a mixtu...

Question

$p H$ of a mixture of $H A$ and $A^{-}$ buffer is $5$ . $K_{b}$ of $A^{-} = 10^{- 10}$ . Hence $\frac{[H A]}{[A^{-}]}$ will be:

A

1

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B

10

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C

0.1

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D

100

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Solution

The correct option is C 0.1
For acidic buffer solution,
pH = pKa + log $\frac{[A -]}{[H A]}$

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