why does an egg dissolve in vinegar
Be sure to completely cover the egg with vinegar so that the entire shell dissolves. If there are any pieces of shell left, the eggs won't bounce. If you put eggs in their shells into vinegar, however, the vinegar will do the work of removing the shell for you. That's right. The vinegar will dissolve the eggshell. This happens because vinegar contains an acid called acetic acid, which reacts with the high calcium content of the eggshell. It takes three or four days for the shell to dissolve completely, and you must wait until all the shell is gone before trying to bounce the egg.