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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.
Carbonic acid is unstable and decomposes to CO2 and H2O like titanium007 said. The foaming is evolution of CO2. Your equation is not completely right. The end products are CaCl2 and CO2. Carbon dioxide then reacts with water which is present to form carbonic acid, H2CO3.Excess CO2 escapes as you saw. 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.nd yes, carbonic acid is soluble. it's dissolved in soda, hence the carbonation when you open the bottle and releases the pressure. More Questions and Answers: The answers post by the user, for information only, FunQA.com does not guarantee the right.