This is my ninth science project. It is about indicators.

Objective: To observe that acids and bases have different properties and to use an acid-base indicator to determine whether liquids are acids or bases.

Predictions:

Observations:

Observations after pouring quarter cup of dark purple cabbage juice:

When I added the cabbage juice to the sour liquids, they turned red, opposed to when I added the cabbage juice to the non sour liquids and they turned purple. I could tell that the non sour liquids were non sour because they would have turned red if they were sour.

Conclusion: Acid-base indicators turn acids red, bases green and neutrals purple. 

The cabbage juice was an acid-base indicator. The indicator turned the white grape juice, the grapefruit juice, and the lemon juice red because they were acids. The indicator turned the antacid and the baking soda water green because they were bases. The indicator kept the milk, the mineral water, and the distilled water the same color because they were neutral.