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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.
Best Answer: Minerals vary widely in their chemical response to groundwater. Calcite, for example, is soluble in a weak acid such as H2CO3 - carbonic acid. Thus, limestone which consists primarily of calcite (CaCO3) is vulnerable to chemical attack by groundwater.Carbonic acid can form by a reaction between water and carbon dioxide.As rainwater, already slightly acidic (pH~6), passes through the atmosphere and the soil layer, it mixes with carbon dioxide and forms carbonic acid.arbonic acid can form by a reaction between water and carbon dioxide. As rainwater, already slightly acidic (pH~6), passes through the atmosphere and the soil layer, it mixes with carbon dioxide and forms carbonic acid.