BCH101intermediate
What is the conjugate acid formed when ammonia (NH₃) accepts a proton?
Answer
NH₄⁺
Explanation
### Why this is right
A base becomes its conjugate acid by accepting a proton. Ammonia gains one hydrogen ion to form ammonium, NH₄⁺.
### The other options
- **NH₂⁻**: this is formed by loss of a proton from ammonia, not proton acceptance.
- **N₂H₄**: this is hydrazine, a different molecule.
- **OH⁻**: this is the hydroxide ion, not ammonia’s conjugate acid.
### Terms
- **Conjugate acid**: the species formed when a base accepts a proton.
- **Proton**: a hydrogen ion, written H⁺.
### Remember
Add one H⁺ to a base to identify its conjugate acid.
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