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This question already has an answer here:

I want to know why in the reaction between HCl and NaHCO3, we have CO2 and H2O instead of H2CO3 ?

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marked as duplicate by aventurin, Mithoron, Jon Custer, airhuff, A.K. Nov 11 '18 at 23:12

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H2CO3 is stable at high pressure or excess of water only

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