AP Chemistrymediummcq1 pt
Four 0.10 M solutions are prepared: HClO₄, HF, CH₃COOH, and HCN. Which has the lowest pH?
A.HF
B.CH₃COOH
C.HCN
D.HClO₄
Explanation
Core Concept
Perchloric acid is strong and ionizes completely, giving [H₃O⁺] = 0.10 M and pH near 1.0. The other three are weak acids whose equilibria supply far less than 0.10 M H₃O⁺ no matter how their Ka values rank. At equal concentration, complete dissociation always beats partial ionization.
Correct Answer
DHClO₄
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