Acid Test (Soda)

Sour taste is the body's way of identifying acid, so if your candy tastes sour, it contains acid. To test for acid yourself, try this:

What you need:

• Fruit-flavored or sour candy, such as LemonHeads, Nerds, Skittles, StarBurst, or Sweet Tarts
  
• Baking soda
  

What to do:

1. Dissolve the candy in a half-cup of water.
   
2. Sprinkle a spoonful of baking soda into water.
   
3. Watch for bubbles. If it bubbles, the candy is acidic.
   

What's happening:
When you dissolve acidic candy in water and add baking soda, the reaction produces carbon dioxide gas. This is what makes the bubbles.