What would you observe after dilute sulfuric acid is added to calcium carbonate?

You will observe the calcium carbonate dissolving readily in dilute sulfuric acid with immediate and vigorous gas evolution. In actuality, calcium carbonate will react with dilute sulfuric acid forming carbon dioxide gas, calcium sulfate and water. Since the calcium sulfate is soluble in water, it will dissolve and you would obtain a clear solution with carbon dioxide bubbling out from the fizzy solution. The reaction can be shown as follows: CaCO3 + H2SO4 ----> CaSO4 + H2O +CO2