Apentix/AP Chemistry/Unit 8: Acids and Bases/Question
AP Chemistryeasymcq1 pt

When NH₃ dissolves in water, which description of its behavior is correct?

A.Every NH₃ molecule gains a proton to form NH₄⁺
B.A small fraction accepts protons from water, setting up an equilibrium with NH₄⁺ and OH⁻
C.NH₃ donates a proton to water, forming NH₂⁻ and H₃O⁺
D.NH₃ decomposes into N₂ and H₂ gas

Explanation

Core Concept

Ammonia is a weak base, so its reaction with water stops far short of completion. Only a small fraction accepts a proton from water, producing matching amounts of NH₄⁺ and OH⁻ while Kb keeps most ammonia unreacted. The small OH⁻ concentration leaves the solution modestly basic.

Correct Answer

BA small fraction accepts protons from water, setting up an equilibrium with NH₄⁺ and OH⁻

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