What is the reaction for HCl + CaCO3? Solution Theoretically, this is a metathes

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Theoretically, this is a metathesis reaction, also called a double-replacement reaction. Essentially, the ions switch partners. CaCO3 + 2HCl ---> CaCl2 + H2CO3 Now, the CaCl2 is a soluble salt, so that's actually just like ions floating around in solution. The H2CO3 is carbonic acid, which is actually just carbon dioxide, CO2, dissolved in water. The carbon dioxide will immediately come out of solution and bubble out, which is totally observable, just like putting baking soda and vinegar together. The more complete reaction full ionic equation is the following: CaCO3 + 2H+ + 2Cl- ---> Ca2+ + 2Cl- + H2O + CO2

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