Question detail
Which of the following statements correctly identifies conjugate acid-base pairs?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Acids and bases (A-level only)
Question
- A. H2SO4 and HSO4- are a conjugate pair.
- B. NH4+ and NH3 are not a conjugate pair.
- C. H2O and H2 are a conjugate pair.
- D. CH3COO- and CH3COOH are not a conjugate pair.
Answer
H2SO4 and HSO4- are a conjugate pair.
Explanation
H2SO4 donates a proton to form HSO4-, making them a conjugate acid-base pair as they differ by one proton.
Common mistake
Identifying Conjugate Pairs
Students often confuse conjugate acid-base pairs by misidentifying the acid and its conjugate base or vice versa.
To correctly identify conjugate acid-base pairs, remember that a conjugate acid is formed when a base gains a proton (H⁺), and a conjugate base is formed when an acid loses a proton. For example, in the reaction HCl + H₂O ⇌ Cl⁻ + H₃O⁺, HCl is the acid and Cl⁻ is its conjugate base, while H₂O is the base and H₃O⁺ is its conjugate acid.
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