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Example of a reactions that forms carbonic acid, then gas: The "baking soda volcano"!
BAKING
VINEGAR
SODA
... but carbonic acid decomposes,
and we get GAS BUBBLES
This is the overall process. We show carbon dioxide and water as products, since
we want to show the reaction as it's actually observed -with carbonic acid broken
down to water and (gaseous) carbon dioxide.