Calculate the concentration in an aqueous mixture containing () and (). — Ionic Equilibrium Chemistry Question

💡 Solution & Explanation

For a mixture of two weak monoprotic acids, $[H^+] = \sqrt{K_{a1}C_1 + K_{a2}C_2}$. Substituting the values: $[H^+] = \sqrt{(1.8 \times 10^{-5})(0.1) + (1.8 \times 10^{-4})(0.01)} = \sqrt{1.8 \times 10^{-6} + 1.8 \times 10^{-6}} = \sqrt{3.6 \times 10^{-6}} = 1.89 \times 10^{-3} \text{ M}$ (since $\sqrt{3.6} \approx 1.897$).