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Question

Name the gas evolved when dilute HCl reacts with sodium hydrogen carbonate. How is it recognized?

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Solution

CO2 gas is evolved. The reaction is as follows:
NaHCO3Sodiumhydrogen carbonate+HCl(aq)HydrogenchlorideNaCl(aq)Sodiumchloride+H2O(l)Water+CO2Carbondioxide
When the produced gas is passed through lime water, lime water turns milky which confirms that the evolved gas is CO2
Ca(OH)2Calcium hydroxide(Lime water)(aq)+CO2(g)CaCO3(s)WhitePrecipitate+H2O(l)

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