Name the gas evolved when dilute HCL reacts with sodium hydrochloric. How is it recognized?
The gas evolved when sodium hydrogen carbonate reacts with HCl is Carbon dioxide.

NaHCO3 + HCl ---->NaCl + H2O +CO2


The gas can be identified by passing through the lime water. when carbon dioxide passes through the lime water, it turns milky due to the formation of calcium carbonate which is insoluble in water.


Ca(OH)2 + CO2 ----> CaCO3 + H2O.


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