Question 1
Question detail
Identify the conjugate acid-base pair in the following reaction: NH3 + H2O ⇌ NH4+ + OH-.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
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Style
Topic
Acids and bases (A-level only)
Question
Identify the conjugate acid-base pair in the following reaction: NH3 + H2O ⇌ NH4+ + OH-.
Answer
The conjugate acid-base pair is NH4+ (the conjugate acid) and NH3 (the conjugate base).
Explanation
This question assesses the understanding of Brønsted-Lowry acid-base theory. The evidence shows that NH4+ is formed from NH3 by gaining a proton, while NH3 can revert to NH4+ by losing a proton, illustrating the concept of conjugate pairs.
Common mistake
Misunderstanding Titration Calculations
Students often confuse the volumes of titrant and analyte when performing calculations using acid-base titration data.
To fix this, students should carefully identify which volume corresponds to the titrant (the solution of known concentration) and which corresponds to the analyte (the solution of unknown concentration) before performing any calculations.
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