The hypothesis is that by combining red cabbage juice with Alka-Seltzer tablets, the color of the mixture will change due to the carbon dioxide generated.

You will make red cabbage juice and mix it with baking soda. Then, you'll pour it into a glass filled with oil, add an Alka-Seltzer tablet, and watch as bubbles and colorful droplets dance around the glass.

You will need red cabbage, canola oil, baking soda, Alka-Seltzer tablets, a tall glass, and a way to extract cabbage juice (such as a blender or boiling method).

When the Alka-Seltzer tablet reacts with water, it releases carbon dioxide gas, which is acidic. The acidic carbon dioxide causes the cabbage juice to change color and the mixture to bubble. The colorful droplets rise through the oil because of their lower density and then sink back down when the carbon dioxide escapes at the top of the oil. It's fascinating to see the color of the cabbage juice change as it becomes more acidic due to the generated carbon dioxide.

This science project is fascinating because it combines chemistry and visual effects. It allows you to explore the concept of pH indicators and how substances change color in response to changes in acidity or alkalinity. The lava lamp effect adds an extra element of excitement to the experiment.

Instead of using red cabbage juice, try using other pH indicators like red wine or blueberry juice to see if they produce different color changes. Add glitter to the mixture before adding the Alka-Seltzer tablet to create a sparkling lava lamp effect.