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NH4+ has Ka = 5.6 × 10^-10 and NH3 has Kb = 1.8 × 10^-5. Their product is about:
A3.1 × 10^-15
B1.0 × 10^14
C1.0 × 10^-14
D1.0 × 10^-7
Answer & Solution
Correct answer: C. 1.0 × 10^-14
5.6 × 1.8 is about 10.1 and the exponents sum to -15, giving 1.0 × 10^-14.
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