Phenolphthalein in a labelled laboratory bottle. This colourless chemical (formula: ) is used as an indicator for acids and bases. The ion t

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Phenolphthalein in a labelled laboratory bottle. This colourless chemical (formula: ) is used as an indicator for acids and bases. The ion that forms with decreasing acidity is pink. This colour change occurs around pH 9, and is used to indicate acid neutralisation of an alkali during titration experiments. The labels indicate that this chemical is flammable and harmful to health.

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Size: 3415px × 5122px
Photo credit: © MARTYN F. CHILLMAID/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

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