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Acidic Buffer Action

1 L of a buff...

Question

$1 L$ of a buffer solution contains one mole each of $C H_{3} C O O H$ & ${(C H_{3} C O O)}_{2} Ba$ . Which of the following options are correct? $(p K_{a} of C H_{3} C O O H = 4.7, log 2 = 0.3)$

pH = 4.7

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pH = 5

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pOH = 9

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pOH = 9.3

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Solution

The correct option is C pOH = 9
For the given buffer solution $p H$ is given by
$p H = p K_{a} + l o g \frac{[C H_{3} C O O^{-}]}{[C H_{3} C O O H]}$
1 mole of $(C H_{3} C O O)_{2} B a$ will give 2 moles of $C H_{3} C O O^{-}$
$p H = 4.7 + l o g \frac{2}{1}$
$p H = 4.7 + 0.3 = 5$
$p O H = 14 - 5 = 9$

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