Phenolphthalein in alkaline solution is which color?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

Phenolphthalein in alkaline solution is which color?

Explanation:
Phenolphthalein acts as an acid–base indicator that changes color with pH. In acidic solutions it is colorless, but in alkaline solutions it becomes pink, with the shade deepening as the solution is more basic. The transition occurs around pH 8.2–10, so in alkaline conditions you observe pink. It doesn’t turn red or blue—those colors belong to other indicators.

Phenolphthalein acts as an acid–base indicator that changes color with pH. In acidic solutions it is colorless, but in alkaline solutions it becomes pink, with the shade deepening as the solution is more basic. The transition occurs around pH 8.2–10, so in alkaline conditions you observe pink. It doesn’t turn red or blue—those colors belong to other indicators.

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