First slide

Ionization constants of weak acids, PH of weak acids

Question

Degree of dissociation of 0.1 N CH₃COOH is (K_a = 1.0 × 10^–5)

Easy

A

10^-5
B

10^-4
C

10^-3
D

10^-2

Solution

Degree of dissociation of a weak acid is given as
$\alpha = \sqrt {\frac{{{K_a}}}{{{C_0}}}} = \sqrt {\frac{{{{10}^{ - 5}}}}{{{{10}^{ - 1}}}}} = {10^{ - 2}}$

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