GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Limestone reacting with acid. When a few drops of 1M hydrochloric acid are poured on a limestone specimen, bubbles are produced. Limestone contains calcium carbonate that reacts with hydrochloric acid to produce carbon dioxide bubbles: CaCO3 + HCl -> CaCl2 + H2O + CO2. This is the mechanism by which acid rain erodes limestone formations.
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