Which gas is released when a dilute acid reacts with a metal carbonate?
Carbon dioxide gas is released
Metal carbonates react with dilute acids to give the corresponding salt, water, and carbon dioxide gas. The general equation is: Metal carbonate + Acid → Salt + Water + CO2.
For example, CaCO3 + 2HCl → CaCl2 + H2O + CO2. The brisk effervescence turns limewater milky, which is the standard test for CO2.
Hydrogen is released when dilute acids react with reactive metals, not with carbonates; oxygen and nitrogen are not products of such acid-carbonate reactions.
Hence, the gas released is carbon dioxide.
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