Indicator Error
Mediumchemistry
Indicator error minimized by selecting indicator whose transition range:
Select the correct option:
Solution
Incorrect! Answer:
Closely brackets equivalence pH
- Ideal Case: The color change should happen exactly at the equivalence point.
- Systematic Error: If the indicator changes color too early or too late, the volume measured is incorrect. This is known as indicator error.
- Selection Rule: Calculate or determine the pH at the equivalence point. Then, choose an indicator such that the equivalence pH lies comfortably within the indicator's transition interval (pKa±1).
- Example: In a strong acid - strong base titration, since the pH changes sharply from 4 to 10, many indicators like methyl orange or phenolphthalein work with minimal error.
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About This Question
- Subject
- chemistry
- Chapter
- practical chemistry
- Topic
- indicator error
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Closely brackets equivalence pH
- Ideal Case: The color change should happen exactly at the equivalence point.
- Systematic Error: If the indicator changes color too early or too late, the volume measured is incorrect. This is known as indicator error.
- Selection Rule: Calculate or determine the pH at the equivalence point. Then, choose an indicator such that the equivalence pH lies comfortably within the indicator's transition interval (pKa±1).
- Example: In a strong acid - strong base titration, since the pH changes sharply from 4 to 10, many indicators like methyl orange or phenolphthalein work with minimal error.
This medium difficulty chemistry question is from the chapter practical chemistry, covering the topic of indicator error. It appeared in the 2025 exam.
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