Borrow some dirty pennies from your piggy bank for this interesting experiment!

Materials Needed

• Medium size cup or bowl
• white vinegar
• water
• salt
• spoon
• paper towels
• 3 dirty pennies
• tablespoon

Procedures

1. Measure 1 tablespoon of salt in a medium-size cup or bowl.
2. Measure 4 tablespoons of vinegar into the cup/bowl with the salt.
3. Mix the solution of salt and vinegar with spoon.
4. Drop in 3 pennies. Stir for 2 minutes.
5. Watch what happens!
6. Take out your pennies and wash them off. Then dry them with a paper towel.
7. Record your observations and keep your pennies for evidence!

WHAT'S HAPPENING?

Vinegar is a chemical called acetic acid. Salt is the chemical sodium chloride. When these two chemicals mix, they react to form a small amount of a new chemical called hydro-chloric acid. This acid has the ability to shine your copper pennies instantly!