A weak monobasic acid HA has Ka = 2.5 × 10⁻³ at 298 K. What percentage of the acid is ionised in a 0.050 mol L⁻¹ solution of HA at 298 K? Do not assume that the degree of ionisation is small compared with 1.

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A weak monobasic acid HA has $K_a = 2.5 \times 10^{-3}$ at $298\ \text{K}$ . What percentage of the acid is ionised in a $0.050\ \text{mol L}^{-1}$ solution of HA at $298\ \text{K}$ ? Do not assume that the degree of ionisation is small compared with 1.

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