Brit + Co Guides Logo

How to make a ph indicator

Make a pH Indicator

5
STEPS
TOOLS

Place the cabbage in the pot and cover it with water. With adult supervision, heat the pot until the water boils for 5 minutes. Let cool.

Drain the water and keep it. Notice the color of the water.

Divide the cabbage water into 3 different glasses or jars.

Add lemon juice or vinegar to 1 glass. What happens to the color of the water?

Add toothpaste or baking soda to another glass. What happens to the color of the water?

  • red cabbage, cut into big chuncks
  • pot to hold the cabbage
  • water
  • stove
  • juicer (optional)
  • 3 clear glasses or jars
  • lemon juice or vinegar
  • toothpaste or baking soda
  • ammonia (optional)