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A base accepts a proton. What is the species it becomes called?
AIts conjugate base
BAn amphiprotic salt
CA hydroxide donor
DIts conjugate acid
Answer & Solution
Correct answer: D. Its conjugate acid
1. Gaining a proton leaves the base with one more hydrogen ion than it started with.
2. That product is called the conjugate acid of the base.
3. It counts as an acid because it can give the proton up again and re-form the base.
4. Ammonia accepting a proton becomes the ammonium ion, its conjugate acid.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 14 "Acid-Base Equilibria", section 14.1 Brønsted-Lowry Acids and Bases_
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