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)
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When we nitric acid is added to egg shell then this happen. Since?egg shell?is made of calcium carbonate. And we know that when calcium carbonate (CaCO3) reacts with?nitric acid?(HNO3) then carbon dioxide, calcium nitrate and water are formed. So same reaction happens when?nitric acid?is added to an?eggshell.
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