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Marble fizzes with acid because it is composed of the mineral calcite (calcium carbonate - CaCO3) which reacts with acids to form the gas carbon dioxide and it is the release of the carbon dioxide gas (CO2) that causes the "fizzing" that is observed during the reaction.

For example a reaction of calcium carbonate and hydrochloric acid will yield calcium chloride (CaCl2), carbon dioxide and water (H2O) as per the following reaction:

CaCO3(s) + 2 HCl(aq) = CaCl2(aq) + CO2(g) + H2O(l)

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13y ago
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Q: Why does the metamorphic rock marble fizz with acid?
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