Red cabbage and blue cabbage – what do they have to do with chemistry?

five glass jars with different colored liquids

In the laboratory, chemists use ready-made test sticks (pH indicators) that can change color to examine whether a liquid is acidic. Unfortunately, we don’t have anything like that at home. But we can make our own test tool with red cabbage juice. How does red cabbage juice change color when it comes into contact with liquids of different acidity?

You will need

  • Approximately 200 g fresh red cabbage
  • Pot or bowl
  • Sieve
  • Scales 
  • Measuring cup
  • Cutting board and knife
  • Empty jam jars
  • Tap water
  • “Test liquids”: dishwashing liquid, citric acid solution*, aqueous solution of baking soda*, distilled water*)

Let’s get started!

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