Question: Phenolphthalein is an acid-base indicator that is colorless below pH 8 and red above pH 8. Explain briefly why the first structure is colorless and

Phenolphthalein is an acid-base indicator that is colorless below pH 8 and red above pH 8. Explain briefly why the first structure is colorless and the second structure is colored.

HOT colorless red OH OH

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