ACS Chemistry Practice Exam 2025 – The All-in-One Guide to Exam Success!

Question: 1 / 400

Which of the following is a weak base that should be memorized?

NaOH

NH3

The identification of ammonia (NH3) as a weak base is well-founded because, unlike strong bases such as sodium hydroxide (NaOH), potassium hydroxide (KOH), and lithium hydroxide (LiOH), which completely dissociate in water, ammonia only partially dissociates. In aqueous solution, ammonia exists in equilibrium with ammonium ions (NH4+) and hydroxide ions (OH-), indicating its weak base nature.

This partial dissociation is characteristic of weak bases, which do not fully ionize in solution, leading to a less pronounced increase in pH compared to strong bases. Recognizing the behavior of ammonia is crucial for understanding acid-base chemistry, as it plays a significant role in various chemical reactions and biological processes. Thus, it is essential for students to memorize ammonia as a weak base as part of their foundational knowledge in chemistry.

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KOH

LiOH

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