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State the solubility of limestone in water.

Answer :

Limestone is largely insoluble in pure water but can dissolve when acids or carbon dioxide are present, leading to the formation of soluble compounds.

The solubility of limestone in water is relatively low. Limestone, primarily composed of the mineral calcite (CaCO3), is considered insoluble in pure water. However, limestone's solubility increases in the presence of acid due to a chemical reaction transforming calcium carbonate into more soluble compounds, like calcium chloride. When limestone is subjected to water containing dissolved carbon dioxide, it dissolves because of the formation of hydrogen carbonate salts. This process is responsible for the natural weathering of limestone, leading to features such as caves and sinkholes.

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