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Phenolphthalein at pH9.3

Phenolphthalein at pH9.3

C029/0935

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Credit

MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY

Caption

Phenolphthalein at pH9.3. In a base solution phenolphthalein is a pink colour. Adding a dilute acid turns it gradually colourless. At pH 9.3 the colour is barely perceivable and by pH 8 it is colourless.

Release details

Model release not required. Property release not required.

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