First slide

Ionization constants of weak acids, PH of weak acids

Question

A monoprotic acid in 0.1 M solution has $K_{a} = 1.0 \times 10^{- 5} .$ The degree of dissociation for acid is

Easy

A

1.0%
B

99.9%
C

0.1%
D

99%

Solution

$K_{a} = {cα}^{2} or 1.0 \times 10^{- 5} = 0.1 \times α^{2} ∴ α = 10^{- 2} or 1 %$

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