Phenolphthalein
Contents
Key Stage 3
Meaning
Phenolphthalein is an indicator dye that changes colour depending on the pH of a solution.
About Phenolphthalein
- Phenolphthalein is a transparent without colour when it is in a neutral solution.
- Phenolphthalein changes colour quickly between pH 7 and 8 to turn pinky purple at pH 8 and beyond.
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References
AQA
- Phenolphthalein, page 115, GCSE Biology; The Revision Guide, CGP, AQA
- Phenolphthalein, page 150, GCSE Chemistry, CGP, AQA