For a weak monobasic acid with concentration and degree of dissociation , which of the following mat — Ionic Equilibrium Chemistry Question

💡 Solution & Explanation

Ostwald's dilution law states $K_a = \frac{C\alpha^2}{1-\alpha}$. For weak electrolytes where $\alpha \ll 1$, $(1-\alpha) \approx 1$, leading to $\alpha = \sqrt{K_a/C}$ and $[H^+] = C\alpha = \sqrt{K_a C}$. It fails completely for strong electrolytes like $HCl$.