AP Chemistryeasymcq1 pt
Which acid is weakest?
A.HCN (Ka = 6.2 × 10⁻¹⁰)
B.HF (Ka = 6.3 × 10⁻⁴)
C.HNO₂ (Ka = 5.6 × 10⁻⁴)
D.CH₃COOH (Ka = 1.8 × 10⁻⁵)
Explanation
Core Concept
The smallest Ka means the least dissociation — HCN barely ionizes, making it the weakest of the four.
Correct Answer
AHCN (Ka = 6.2 × 10⁻¹⁰)
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