What happens when a piece of an egg shell is placed into a beaker of dilute hydrochloric acid?

Question

the egg shell mentioned above is only the shell, not the contents of the egg...

please try to answer scientifically...i need the marks badly!!

10 points for grabs!!

Answer 1

It bubbles as it dissolves.  The eggshell is mostly calcium carbonate.  Carbonate compounds react with acids to liberate carbon dioxide gas.

CaCO3(s) + 2HCl(aq) --> CaCl2(aq) + CO2(g) + H2O(l)

Net ionic equation:

CaCO3(s) + 2H+ --> Ca2+ + CO2(g) + H2O(l)