How do you produce and test carbondioxide gas in your lab ?
Base+Metal`to`Salt+Hydrogen

Explanation

1) Take two test tubes, label them as A and B.
2) Take about 0.5 gm of sodium carboN/Ate `(N/ACO_3)` in test tube A and about 0.5 gm of sodium hydrogen carboN/Ate `(N/AHCO_3)` in test tube B.
3) Add about 2 ml of dilute HCl to both the test tubes.
4) Pass the gas produced in each case through lime water and record your observations.
5) We observe that the lime water turns to milky
6) The reactions are
`N/A_2CO_3+2HClto2N/ACl+H_2O+CO_2`
`N/AHCO_3+HCltoN/ACl+H_2O+CO_2`
Reactions when the gas is passed through lime water.
`Ca(OH)_2+CO_2toCaCO_3dowN/Arrow+H_2O`
On passing excess carbondixide, the following reaction takes place.
`CaCO_3+H_2O+CO_2toCa(HCO_3)_2`
Thus from the above activities we can conclude that the reaction of metal carboN/Ates and hydrogen carboN/Ates with acids give a corresponding salt, carbondioxide and water.