When titrating a weak acid (e.g., ) with a strong base (e.g., ), which indicator must be used to accurately detect the equivalence point, and why?

Question

When titrating a weak acid (e.g., $CH_3COOH$) with a strong base (e.g., $NaOH$), which indicator must be used to accurately detect the equivalence point, and why?

Prashant Kotian · Accepted Answer

Correct answer: B. In a WA-SB titration, the salt formed undergoes anionic hydrolysis, making the equivalence point strictly basic (). Phenolphthalein's working range (8.2-10) perfectly matches the vertical pH jump.

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