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When an acid donates a proton, the species left behind is called its:
AConjugate base
BConjugate acid
CSpectator ion
DReducing agent
Answer & Solution
Correct answer: A. Conjugate base
1. A Bronsted-Lowry acid is a proton donor.
2. When an acid donates a proton, the species that remains is called the conjugate base of the acid.
3. It gets that name because it reacts as a proton acceptor in the reverse reaction.
4. The conjugate acid is what a base becomes after accepting a proton.
_Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 14 'Acid-Base Equilibria', sections 14.1-14.7_
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