Acid test

Acid test

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Credit: GIPHOTOSTOCK/SCIENCE PHOTO LIBRARY

Caption: Acid test. A pH indicator changes the colour depending on the pH of the solution. Here a universal indicator paper strip has changed colour from yellow to red after it was put in contact with a freshly sliced lemon (citric and ascorbic acids)

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Keywords: acid, acidity, ascorbic acid, chemical, chemistry, citric, citric acid, demonstration, educational, effect, indicator, lemon, paper, ph, still life, strip, test, universal indicator, vitamin c

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