Phenolphthalein is used as a single indicator in acid-base titrations. At left it is shown in a base solution and is a pink colour. Adding a dilute ac

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Phenolphthalein is used as a single indicator in acid-base titrations. At left it is shown in a base solution and is a pink colour. Adding a dilute acid turns it gradually colourless. At pH (ight) the colour is barely perceivable and by pH 8 it is colourless.

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Photo credit: © MARTYN F. CHILLMAID/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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