Acid does because it does.
an egg's shell doesn't dissolve in water because the shell is to hard to dissolve in non-acid liquids.
no
eat them
Yes. The vinegar helps dissolve the shell surface, giving way to the membrane underneath that makes the egg "bouncy."
The egg shell might be too dense to dissolve. It probrobly will dissolve eventually, but I don't really know. (Dense means how closely the atoms are compacted together)
acetic acid
Yes Egg shell is made from calcium and the hydrochloric acid that the stomach produces wil rapidly dissolve it.
put it in vinegar
To make a transparent egg, carefully place a raw egg in vinegar for a few days. The vinegar will dissolve the calcium carbonate shell, leaving behind the semi-permeable membrane that allows you to see through the egg.
Vinegar would dissolve just the shell, I don't know what lemon and lime juice do.
Vinegar will dissolve the egg shell. Salt water will not do anything.
place it in a bowl of vinegar and the shell will dissolve separating the shell which is now dissolved and the egg which is still being held in the membrane