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Carbonic acid, which is a weak acid, forms when rainwater and carbon dioxide in the air react with one another. When carbonic acid comes into contact with limestone or calcium carbonate, it can cause it to dissolve over a long period of time. In nature, this reaction leads to the formation of caves.
Report Abuse. in an acid-base reaction where the base is a carbonate (CO3 or bicarbonate HCO3) three products will form: water, carbon dioxide and a salt. the carbon dioxide is what you obsered with the fizzing.CaCl2 you have correctly identified as the salt.And yes, carbonic acid is soluble. it's dissolved in soda, hence the carbonation when you open the bottle and releases the pressure.aCl2 you have correctly identified as the salt. And yes, carbonic acid is soluble. it's dissolved in soda, hence the carbonation when you open the bottle and releases the pressure.