AP Chemistryeasymcq1 pt
In the equilibrium NH₃ + H₂O ⇌ NH₄⁺ + OH⁻, which pairing identifies the two conjugate acid-base pairs?
A.NH₃/NH₄⁺ and H₂O/OH⁻
B.NH₃/OH⁻ and H₂O/NH₄⁺
C.NH₄⁺/OH⁻ and NH₃/H₂O
D.NH₃/H₂O only, since water is just the solvent
Explanation
Core Concept
Conjugate pairs differ by exactly one proton. NH₃ becomes NH₄⁺ after accepting H⁺, and H₂O becomes OH⁻ after donating H⁺. Matching partners by that one-proton difference is the fastest way to read any acid-base equilibrium.
Correct Answer
ANH₃/NH₄⁺ and H₂O/OH⁻
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