Materials
-6 large mason jars
-Vinegar
-2 hard boiled eggs
-2 chicken bones
-2 seashells
Procedure
Place a hard boiled egg in each of two mason jars. Fill one of the jars with water and the other with vinegar. Next. place a well-washed chicken bone in each of the two mason jars. Fill one of the jars with water and the other with vinegar. Now, place a seashell in each of two mason jars. Fill one of the jars with water and the other with vinegar. Now wait about 4 days. The objects which have been sitting in vinegar have changed. The objects which have been sitting in water are the same. The bone will be bendy, the seashell will be squishy, and the egg shell will be gone making for a bouncy egg.
What's Going On?
Calcium carbonate is in egg shells, bones, and seashells. When calcium carbonate comes into contact with vinegar, which contains acetic acid, a chemical reaction occurs. Simply put, the calcium carbonate breaks down into a "calcium part" and a "carbonate part". The "calcium part" is a calcium salt that dissolves or precipitates and the "carbonate part" is a carbon dioxide which bubbles away. Water is also a product of the reaction. One might say the acetic acid dissolves the calcium from the bone, egg, and seashell.
