First slide

Ionization constants of weak acids, PH of weak acids

Question

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

Moderate

A

9
B

3
C

11
D

10

Solution

Dissociation constant of HA = $10^{- 9}$
$HA ⇌ H^{+} + A^{-}$
$[H^{+}] = \sqrt{\frac{K_{a}}{C}} = \sqrt{\frac{10^{- 9}}{0.1}}; [H^{+}] = 10^{- 4} ∴ pH = 4 ∵ pH + pOH = 14 pOH = 14 - pH = 14 - 4; pOH = 10$

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