Explore acid-base reactions using cabbage juice as a natural indicator. Learn how different solutions change color when mixed with the juice, indicating their pH levels.
If cabbage juice is mixed with different solutions, then the color change will indicate whether the solution is acidic or basic.
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Chop the red cabbage into small pieces.
Boil the cabbage in 2 cups of distilled water for 10 minutes.
Strain the cabbage pieces to collect the purple liquid as cabbage juice.
Pour equal amounts of cabbage juice into each clear cup.
Add a small amount of vinegar to one cup and stir.
Add a small amount of baking soda to another cup and stir.
Add lemon juice to a third cup and stir.
Add soap solution to the fourth cup and stir.
Observe and record any color changes in each cup.
Compare the colors to determine if each solution is acidic or basic.
Cabbage juice will change colors based on the pH of each solution, indicating whether they are acidic or basic. Vinegar and lemon juice should turn the solution pink/red (acidic), while baking soda should turn it blue/green (basic).
Type of solution added
Color change in cabbage juice
Amount of cabbage juice, Temperature of solutions, Type of container
Ensure proper supervision while boiling the cabbage and handling hot liquids. Avoid ingestion of substances.
Create a color chart to compare the colors of solutions.
Include a pH scale to explain acidity and basicity.
Use visuals or photos to show the color changes.
Cabbage juice contains anthocyanins, which change color based on the pH of the solution.
Yes, other vegetables like beets can also work as natural pH indicators.
You can test other household items like soda, milk, or juice using the same procedure.
