This week's LabZone activity.

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  • Source:
    Science News for Kids. 8/8/2007, p2-2. 1p.
  • Additional Information
    • Subject Terms:
      PH effect; HYDROGEN-ion concentration; CABBAGE; ANTHOCYANINS; SOLUTION (Chemistry); CHEMICAL reactions
    • Abstract:
      The article describes an experiment that uses a cabbage juice indicator to test the pH of different solutions. There are several types of indicators, some are liquids and some are concentrated on strips of litmus paper. Indicators can be extracted from different sources. Red cabbage contains an indicator pigment molecule called flavin, which is one type of molecule called an anthocyanin. Very acidic solutions will turn anthocyanin a red color. Neutral solutions result in a purplish color. Basic solutions appear in greenish-yellow.