Phenolphthalein Indicator

Phenolphthalein Indicator

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Credit: Phil Degginger/SCIENCE PHOTO LIBRARY

Caption: A phenolphthalein indicator used in solutions with a regression (from left to right) of acidity. At left is a very acidic solution and far right is a very basic, or alkali solution.

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Keywords: acid, alkali, base, c20h14o4, chemical, chemical compound, chemistry, colour, hin, indicate, neutral, ph, ph indicator, phenolphthalein, phenolphthalein indicator, phph, reaction, solution

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