Question

why dose pink color reapper when NaOH is added

Answer 1

Answer:

When the sodium hydroxide, which is a base, is mixed with phenolphthalein, it turns pink. ... This happens because the base is neutralized in an acid solution, which causes the indicator to become colorless. All of the base is neutralized by the citric acid.

Explanation:

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Answer 2

Answer:

In alkaline solution, phenolphthalein gives pink color as it works as an indicator which shows its endpoint when it reacts with hydroxide ions of the base. It is a commonly used indicator in acid-base titrations. In acidic solution when acid is added, phenolphthalein gives a colorless solution.