In a mixture containing and (), what is the total concentration? — Ionic Equilibrium Chemistry Question

💡 Solution & Explanation

Let acid dissociate by $x$. $[H^+] = 0.01 + x$, $[A^-] = x$, $[HA] = 0.01 - x$. $K_a = x(0.01+x)/(0.01-x) = 0.0255$. Solving the quadratic yields $x \approx 0.0061 \text{ M}$. Total $[H^+] = 0.01 + 0.0061 = 0.0161 \text{ M}$.