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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 is dissolved in water and can only exist in a solution. It is a weak, unstable dibasic acid and that forms carbonate and bicarbonate salts.Carbonic acid can gives two series of salts: carbonate and hydrogen carbonate salt.arbonic acid is formed when carbon dioxide is dissolved in water and can only exist in a solution. It is a weak, unstable dibasic acid and that forms carbonate and bicarbonate salts.