According to the Bronsted-Lowry description of acids and bases;
A Brønsted–Lowry acid is a substance that is a proton (H⁺) donor.
A Brønsted–Lowry base is a substance that is a proton acceptor.
When a Brønsted–Lowry acid donates a proton, it forms a conjugate base and, when a Brønsted–Lowry base accepts a proton, it produces a conjugate acid.
Consider the given reactions:
1. HCl (aq) + NH₃ (aq) ---> NH₄⁺ (aq) + Cl⁻ (aq)
HCl (aq) is the acid while NH₃ (aq) is the base
2. H₂O (l) + N₂H₄ (aq) ---> N₂H₅⁺ (aq) + OH⁻ (aq)
H₂O (l) is the acid and N₂H₄ (aq) is the base
3. C₃H₇NH₂ (aq) + H₃O⁺ (aq) ---> C₃H₇NH₃⁺(aq) + H₂O
C₃H₇NH₂ (aq) is the base while H₃O⁺ (aq) is the acid.
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