The hydrogen ion concentration in mol/dm, in a 0.2 M solution of a weak acid

The hydrogen ion concentration in mol/dm, in a 0.2 M solution of a weak acid HA (Ka = 2 x 10⁻⁵) is close to

Options

(a) 2 x 10⁻⁵
(b) 2 x 10⁻⁴
(c) 2 x 10⁻³
(d) 2 x 10⁻²

Correct Answer:

2 x 10⁻³

Explanation:

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