The hydrogen ion concentration of a HCl aqueous solution at 298 K () is closest to: — Ionic Equilibrium Chemistry Question
Question
The hydrogen ion concentration of a $10^{-8} \text{ M }$ HCl aqueous solution at 298 K ($K_w = 10^{-14}$) is closest to:
Answer: B
💡 Solution & Explanation
For highly dilute acids, water's autoionization is significant. $[H^+]_{total} = 10^{-8} + x$, $[OH^-] = x$. Solving $(10^{-8} + x)(x) = 10^{-14}$ gives total $[H^+] \approx 1.05 \times 10^{-7} \text{ M}$.
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