For a weak acid HA with dissociation constant $10^{- 9}, p O H$ of its 0.1 M solution is:

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Solution

The correct option is A 9
Dissociation constant of $H A = 10^{- 9}$
$H A ⇌ H^{+} + A^{-}$

$[H^{+}] = \sqrt{K_{a} C}$

$∴ p H = 5$

$∵ p H + p O H = 14$

$p O H = 14 - p H = 14 - 5; p O H = 9$

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