Acid and Rocks

Rocks such as limestone, marble, calcite, and chalk react with the acid in this way. Acid rain can also break down rocks, just as vinegar can. Many ancient buildings and statues are made of marble, and acid rain is causing some of them to slowly dissolve.

Acid Test

Challenge your children to check to see if rocks and minerals contain calcium carbonate with an acid test.

What You'll Need:
  • Rocks
  • Small cups
  • Vinegar
How to Create an Acid Test:

Step 1: Have your children gather several small pieces of different kinds of rock. They should then place each piece into a different cup.

Step 2: Ask your kids to pour enough vinegar in each container to almost cover the rock. Have them check to see if the rock starts fizzing. If it does, they'll know that the rock contains calcium carbonate because the acid in the vinegar reacts with calcium carbonate to cause the fizzing.

Keep reading science projects for kids: chemical reactions to learn how your kids can gross out their friends and learn about carbon dioxide gas at the same time.

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