Question

how can we identify the librating gas when metal carbonate or a metal hydrogen carbonate reacts with an acid

Answer 1

Hey friend, ☺ here is ur answer __________________________

Acid + Metal carbonate / metal hydrogencarbonate = Salt + Carbon dioxide + Water

As we can see that CO2 gas is released.

Test to identify this gas :-

Pass this gas through lime water . If lime water turns milky, then this gas is CO2.

* the formula of lime water is Ca(OH)2 i.e. Carbon hydroxide.

When excess amount of CO2 is passed through lime water then milkiness disappears .

And lime water is milky bcoz of the formation of Calcium Carbonate ( CaCO3).

hope this helps u...