The degree of dissociation of an aqueous solution of acetic acid is given by the expression , where — Ionic Equilibrium Chemistry Question
Question
The degree of dissociation of an aqueous solution of acetic acid is given by the expression $\alpha = 0.1 \times C^{-1}$, where $C$ is the molar concentration of the acid. What is the exact pH of the solution?
Answer: A
💡 Solution & Explanation
For a weak monoprotic acid, the hydrogen ion concentration is given by $[H^+] = C\alpha$. Substituting the given expression for $\alpha$, we get $[H^+] = C \times (0.1 \times C^{-1}) = 0.1 \text{ M}$. Thus, $pH = -\log[H^+] = -\log(0.1) = 1$.
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