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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 formed when carbon dioxide gas is dissolved in water. H2O + CO2 <--------> H2CO3. Though looking simple, this reaction is the basic principle involved in the manufacture of club soda, coca cola, Pepsi etc.,. These beverages are made by dissolving carbon dioxide gas in water at high pressures.