What is observed in the reaction between an acid and a carbonate?

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Acids are substances that dissolve in water to generate an excess of Hions. They react with bases to produce a salt and water. With metal carbonates, products include a salt of that metal (depending on the acid and metal), water and carbon dioxide. For example:

Sodium carbonate (NaCO3) + Hydrogen Chloride (HCl) -> Sodium chloride (NaCl) + water (H2O) + carbon dioxide (CO2))

Thus, observations in this reaction include bubbling from the release of CO2. When collected, the gas turns lime water milky.

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