Phenolphthalein a single indicator

Phenolphthalein a single indicator

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This image is part of the sequence Sciecne and technology: Phenolphthalein indicator

Credit: MARTYN F. CHILLMAID/SCIENCE PHOTO LIBRARY

Caption: Phenolphthalein is used as a single indicator in acid-base titrations. In a base solution, as here at pH11, 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.

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Keywords: acid, acid-base, alkali, base, chemical, chemistry, color dilute acid, colorless, colour, colourless, conical flasks, experiment, fuchsia, hydrogen ion concentration, indicator, no-one, nobody, ph, ph 11, phenolphthalein, pink, school science, science education, single indicator, solution, titrations, white background

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