Acid– base test science fair project

Principle:
Learn the difference between an acid and a base with this experiment. .

Materials Required:
a hand full of chopped Red Cabbage
Water
Baking soda
Vinegar
Strainer
Two glass bowls
A blender

Procedure:
Blend the chopped red cabbage with water to make it a puree.
Stain the mixture and pour the juice into two glass bowl.
Now Add few drops of vinegar (acid) to the first glass bowl and observe.
Add little baking soda (base) to the second glass bowl and observe.
Add vinegar into the second bowl and observe the results. Same way, add backing soda to the first bowl and observe the results.

Inference

Red cabbage juice has an interesting property, it changes colors depend if it is exposed to an acid or a base (cabbage juice is known as an acid/base indicator). Cabbage juice is naturally neutral. When it is neutral, it is a purplish color. If an acid is poured into it, it will turn reddish. If abase is added, it turns blue or greenish. Vinegar makes your juice turn red, so vinegar is an acid. Baking-soda makes it turn blue or greenish, so baking-soda is a base. By mixing an acid to a base (like when you added vinegar to your baking-soda and juice mixture),you made your solution become more an acidic. As you add acid, your solution changes from abase (blue/greenish) to a neutral solution (purple) and finally to an acidic solution (reddish). The opposite is true, when you add a base to an acid solution.