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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Apply (H+ = k (ionisation constant of weak acid)× c(concentration))
Apply (H+ = k (ionisation constant of weak acid)× concentration ))