Answer :
I believe the answer is C. It is the Lewis definition that helps explain why ammonia is a base. According to Lewis' definition, bases donate electrons while the acids accept these electron. In the reaction, ammonia releases electron while the water accepts it.
Answer:
Bronsted- Lowry definition helps to explain why ammonia is a base.
Explanation:
The Brönsted - Lowry theory states that acids are substances capable of yielding protons (hydrogen H⁺ ions) and substance bases capable of accepting them.
Then, the acid-base reaction is one in which a transfer of H⁺ protons occurs from an acid to a base.
A base acid conjugate pair is then produced, where the base conjugate acid is the one formed when the base receives an H⁺; and the conjugate base of the acid, is the base formed when the acid yields an H⁺.
You know this reaction:
H₂O (l) + NH₃ (aq) → OH⁻ (aq) + NH₄⁺ (aq)
In this case you can see that the water acts as an acid, because it gives a proton to the ammonia. Then the ammonia will act as the basis for accepting the proton. The conjugate base of water is the hydroxide ion (OH⁻) and the conjugated acid of ammonia is the ammonium ion (NH₄⁺).
Then, Bronsted- Lowry definition helps to explain why ammonia is a base.