Acid-base Titration
Phenolphthalein is suitable indicator for titration of:
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About This Question
- Subject
- chemistry
- Chapter
- principles related to practical chemistry
- Topic
- acid-base titration
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Strong base vs weak acid
An indicator is suitable if its color change interval includes the pH at the equivalence point.
- For a Weak Acid vs Strong Base titration (e.g., Acetic acid vs NaOH), the salt formed (Sodium acetate) undergoes basic hydrolysis. The pH at the equivalence point is >7 (typically 8 to 9).
- Phenolphthalein changes color in the range pH8.3−10.0 (Colorless to Pink).
- Thus, it fits perfectly for this titration. It is NOT suitable for Strong Acid vs Weak Base because the end point pH would be <7.
This medium difficulty chemistry question is from the chapter principles related to practical chemistry, covering the topic of acid-base titration. It appeared in the 2025 exam.
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