Calcite (the main mineral in limestone) is made of calcium carbonate (CaCO3). Dolomite, a related mineral, is made of magnesium carbonate (MgCO3). What happens if a geologist drips a small amount of vinegar (acetic acid) onto a sample of dolomite?

Vinegar is an acid, and acids react with carbonate minerals to produce carbon dioxide gas. Dolomite contains magnesium carbonate, so the reaction can cause fizzing even though dolomite contains no calcium. The correct choice is “Fizzing will occur because carbon dioxide is produced.”

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