Question detail
Which indicator would be best for a titration involving a weak acid and a strong base?
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. Methyl orange
- B. Phenolphthalein
- C. Bromothymol blue
- D. Universal indicator
Answer
Phenolphthalein
Explanation
Phenolphthalein is suitable for weak acid-strong base titrations because its transition range aligns with the expected pH change at the equivalence point, which is typically above pH 7.
Common mistake
Indicator Selection Mistake
Students often confuse the transition range of indicators with their pH range, leading to incorrect indicator selection for titrations.
To select a suitable indicator, use the formula for pH transition range. For example, if the equivalence point of a titration is at pH 7, choose an indicator with a transition range that includes pH 7. Ensure to check the specific pH range of the indicator and compare it with the expected pH at the equivalence point.
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