Make your own pH paper strips
Anthocyanin is a chemical found in plants such as cabbage, roses, and berries. It will change color based on the presence of an acid or a base.
100 mL water
50 mL Rubbing alcohol
3 leaves of cabbage or 1 rose
or 1/2 cup of berries
Affiliate links to chemicals.
*Note: These chemicals can be purchased locally at stores such as Walmart/Target.
Piece of paper
Alcohol burner + stand + lighter
1. In Erlenmeyer flask, pour in water and boil on alcohol stand.
2. In blender, blend boiling water and cabbage/rose/berries for 2 minutes.
3. In plastic beaker, measure isopropanol and pour into glass beaker.
4. In glass beaker, strain in blended liquid and isopropanol.
5. Submerge a paper in the glass beaker.
6. Let dry and cut into strips.
The Science Behind the Reaction
Anthocyanins are chemicals that change color when introduced to certain conditions: purple for neutral conditions (pH 7.0), red for acidic conditions (pH < 7.0), and blue for basic conditions (pH>7.0).
1. Compare the acidity of the different drinks in your fridge.
2. Paint a whole sheet with the liquid and then sprinkle on baking soda and lemon juice for a creative work of art!