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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.
Answer by Banana821. Confidence votes 2. Limestone is calcium carbonate (CaCO3) which when heated to above 840Â°C decomposes into calcium oxide (CaO) while releasing carbon dioxide (CO2) according to the equation: CaCO3(s) â CaO(s) + CO2(g). CaO is commonly known as lime, quicklime, or burnt lime.