Which of the following are conjugate acid-base pairs in the acid-base reaction between ethanamine and water? CH₃CH₂NH₂ (aq) + H₂O (l) ⇌ CH₃CH₂NH₃⁺ (aq) + OH^- (aq)
I.H₂O and CH₃CH₂NH₂
II.H₂O and OH^-
III.CH₃CH₂NH₂ and CH₃CH₂NH₃⁺
IV.CH₃CH₂NH₃⁺ and OH^-

Question

Quizplus · Accepted Answer

Conjugate acid-base pairs differ by a proton (H+). In the given reaction, water (H2O) acts as a base and accepts a proton to form OH- (hydroxide ion), making H2O and OH- a conjugate acid-base pair. Ethanamine (CH3CH2NH2) acts as a base and accepts a proton to form CH3CH2NH3+, making CH3CH2NH2 and CH3CH2NH3+ a conjugate acid-base pair.

Which of the Following Are Conjugate Acid-Base Pairs in the Acid-Base