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Sodium carbonate will react with acid to produce carbon dioxide, water, and the corresponding sodium salt of that acid in a two step reaction. We will use hydrochloric acid for this example.

Sodium carbonate and hydrochloric acid combine to form sodium chloride and carbonic acid.

Na2CO3 + 2HCl --> H2CO3 + 2NaCl

Carbonic acid is unstable and will readil break down into carbon dioxide and water.

H2CO3 --> CO2 + H2O

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Q: Why does sodium carbonate produce gas?
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