What you need:
- Fruit-flavored or sour candy, such as LemonHeads, Nerds, Skittles, StarBurst, or Sweet Tarts
- Baking soda
What to do:
- Dissolve the candy in a half-cup of water.
- Sprinkle a spoonful of baking soda into water.
- Watch for bubbles. If it bubbles, the candy is acidic.
When you dissolve acidic candy in water and add baking soda, the reaction produces carbon dioxide gas. This is what makes the bubbles.