Question detail
Explain how to select a suitable indicator for a titration involving a strong acid and a weak base using a pH curve.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Acids and bases (A-level only)
Question
Explain how to select a suitable indicator for a titration involving a strong acid and a weak base using a pH curve.
Answer
To select a suitable indicator, identify the pH range at the equivalence point of the titration from the pH curve. Choose an indicator that changes color within this pH range, ensuring it can accurately signal the endpoint of the titration.
Explanation
This answer demonstrates understanding of how the pH curve indicates the equivalence point and the importance of matching the indicator's transition range to this point. It tests the ability to apply knowledge of acid-base titrations and indicators.
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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