AP Chemistrymediummcq1 pt
A 0.10 M solution of weak acid HA has [H⁺] = 1.0 × 10⁻² M at equilibrium. What is the percent ionization?
A.1.0%
B.10%
C.90%
D.0.10%
Explanation
Core Concept
Percent ionization equals the ionized concentration divided by the initial concentration, multiplied by one hundred. Here that is (1.0 × 10⁻² ÷ 0.10) × 100 = 10%. The modest value confirms a weak acid, since a strong acid at equal concentration would approach complete ionization.
Correct Answer
B10%
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