Discoloration of phenolphthalein?

25 April 2023 1 5K Report

Phenolphthalein changes colorless at less than Ph 8.3 and light red at 8.3 to 10.0. I wonder if the phenolphthalein solution is colorless or red at acidity above Ph10.0.??

Prem Baboo

Phenolphthalein is colorless above pH 10, and pink between 8 and 10. See, attached figure.

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