Question

Name the gas evolved when dilute hcl reacts with sodium hydrogen carbonate. how is it recognised?

Answer 1

=>When dilute hydrochloric acid reacts with sodium hydrogen carbonate, Carbon dioxide gas is liberated .We recognize the presence of carbon dioxide by passing it through lime water which turns milky or a white precipitate of calcium carbonateis formed.
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Answer 2

Explanation:

Carbon dioxide (CO2) gas is evolved during the reaction. We pass this gas through lime water which turns milky because of the CO2 passing through it. If we keep on passing the gas through the milky lime water, it would become clear again