acid-base indicators

Question

Phenolphthalein is a suitable indicator for titration between:

RankGuru · Accepted Answer

**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.

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acid-base indicators

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