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Reaction of Acids with Metal Carbonates and Bicarbonates

Name the gas ...

Question

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

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Solution

When dilute hydrochloric acid reacts with sodium hydrogen carbonate, carbon dioxide gas is evolved.
The reaction is as follows:

$N a H C O_{3} + H C l \to N a C l + H_{2} O + C O_{2}$

On passing $C O_{2}$ through lime water, it turns milky.

$C a {(O H)}_{2} (a q) + C O_{2} (g) ⟶ C a C O_{3} (s) + H_{2} O (a q)$

Hence, the gas evolved is carbon dioxide.

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Q. When carbonates are reacted with

H C l

, the gas evolved is:

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