Acid-base Indicators
Phenolphthalein is a suitable indicator for titration between:
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About This Question
- Subject
- chemistry
- Chapter
- equilibrium
- Topic
- acid-base indicators
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Weak acid and strong base
Phenolphthalein is a synthetic indicator with a working pH range of approximately 8.3 to 10.0 (transition from colorless to pink).
- In a titration between a Weak Acid (e.g., Acetic acid) and a Strong Base (e.g., NaOH), the salt formed (Sodium acetate) undergoes basic hydrolysis.
- This means the pH at the equivalence point is >7 (typically around 8.5−9).
- Since this pH falls perfectly within the phenolphthalein range, it is the ideal choice for this titration.
This easy difficulty chemistry question is from the chapter equilibrium, covering the topic of acid-base indicators. It appeared in the 2025 exam.
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