Use purple cabbage juice to test acids and bases at home. A facinating chemistry STEM activity for preschoolers and school children.
Boil or blend purple cabbage with water to extract the purple juice — this is your indicator.
Pour the cabbage juice into three separate plastic cups.
Add white vinegar to the first cup (acid) — observe the colour change to red-pink.
Add baking soda solution to the second cup (base) — observe the colour change to green.
Leave the third cup as neutral — compare all three colours and discuss the pH scale
| School Board | Topic Covered | Grade |
| NCERT/CBSE | Acids, Bases and Salts | Grade 5–6 |
| Samacheer Kalvi | Acids and Bases | Standard 5–6 |
| Cambridge | Materials and their Properties | Stage 4–5 |
| Oxford | Chemistry, Materials | Grade 5 |