Apentix/AP Chemistry/Unit 4: Chemical Reactions/Question
AP Chemistrymediummcq1 pt

In NH₃(aq) + H₂O(l) ⇌ NH₄⁺(aq) + OH⁻(aq), which pair consists of Brønsted-Lowry conjugate partners?

A.Ammonium and ammonia (NH₄⁺ / NH₃)
B.Ammonium and hydroxide (NH₄⁺ / OH⁻)
C.Ammonia and hydroxide (NH₃ / OH⁻)
D.Water and ammonium (H₂O / NH₄⁺)

Explanation

Core Concept

Conjugate partners differ by exactly one proton. Ammonia becomes ammonium after accepting H⁺, locking the two together as one acid-base pair, while water becomes hydroxide after donating H⁺, forming the other pair. Matching species by a single transferred proton is the entire skill behind conjugate-pair questions.

Correct Answer

AAmmonium and ammonia (NH₄⁺ / NH₃)

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