Which gas is released when a carbonate reacts with an acid?

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Multiple Choice

Which gas is released when a carbonate reacts with an acid?

Explanation:
When a carbonate reacts with an acid, carbon dioxide is released. The acid donates hydrogen ions to the carbonate, converting it into carbon dioxide and water while the remaining ions form a salt. A typical example is a carbonate reacting with hydrochloric acid to give a salt, carbon dioxide, and water: CaCO3 + 2HCl → CaCl2 + CO2 + H2O. The bubbling you observe is the carbon dioxide gas escaping. Water is formed as a liquid under normal conditions, so it isn’t the gas you see. Hydrogen or oxygen aren’t produced in this reaction.

When a carbonate reacts with an acid, carbon dioxide is released. The acid donates hydrogen ions to the carbonate, converting it into carbon dioxide and water while the remaining ions form a salt. A typical example is a carbonate reacting with hydrochloric acid to give a salt, carbon dioxide, and water: CaCO3 + 2HCl → CaCl2 + CO2 + H2O. The bubbling you observe is the carbon dioxide gas escaping. Water is formed as a liquid under normal conditions, so it isn’t the gas you see. Hydrogen or oxygen aren’t produced in this reaction.

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