Limestone reacting with acid

Limestone reacting with acid

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Credit: ANDREW LAMBERT PHOTOGRAPHY/SCIENCE PHOTO LIBRARY

Caption: Limestone reacting with acid. Pipette being used to add dilute acid to a lump of limestone (calcium carbonate, CaCO3). Bubbles of carbon dioxide gas are being produced in the resulting reaction. This is an acid-base reaction, where calcium carbonate (the base) reacts with the acidic hydrogen (H+) to form aqueous calcium ions & carbonic acid (H2CO3). This acid is unstable, and rapidly decomposes to form carbon dioxide (CO2) and water (H2O). This is how rainwater erodes limestone. The equations for this reaction are: 1) CaCO3 + 2H(+) ----> Ca(2+) + H2CO3 2) H2CO3 ----> CO2 + H2O

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Keywords: acid, acid rain, apparatus, base, bubble, bubbles, calcium carbonate, carbon dioxide, chemical, chemicals, chemistry, demonstrating, demonstration, dilute, drop, dropping, eroding, erosion, experiment, fizz, fizzing, gas, glassware, limestone, lump, pipette, reacting, reaction, rock, watch glass

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