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What is Ka of NH4+ (the conjugate acid of NH3), given Kb of NH3 = 1.8 × 10^-5?
A5.6 × 10^-5
B5.6 × 10^-10
C1.8 × 10^9
D1.8 × 10^-19
Answer & Solution
Correct answer: B. 5.6 × 10^-10
Ka = Kw / Kb = 10^-14 / 1.8 × 10^-5 = 5.6 × 10^-10.
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