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In the classic NaOH-phenolphthalein-HCl activity, the pink colour disappears on adding HCl drop by drop because

Question
In the classic NaOH-phenolphthalein-HCl activity, the pink colour disappears on adding HCl drop by drop because
The medium becomes acidic
The medium becomes more basic
Water evaporates from the mixture
A precipitate forms
Answer
The medium becomes acidic
Detailed Explanation
As HCl neutralises the NaOH, the medium loses its basic character and phenolphthalein loses its pink colour. — Examisthan.com
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