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When carbon dioxide dissolves in water, it can do so as a gas dissolved in water or by reacting with water to produce carbonic acid. Carbonic acid is known as a weak acid because it partially dissociates into the positive Hydrogen ions and negative bicarbonate ions.his means that some of the added hydrogen ions will react with the bicarbonate ions to produce carbonic acid and the carbonic acid will dissociate into carbon dioxide and water as shown below. When hydrogen ions are removed from the reaction, the equilibrium will shift to the right.
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.