Activity 2.5 NCERT Class 10 Science, Chapter 2 Acids, Bases, and Salts.
Activity 2.5 asks us to react metal carbonates and metal hydrogen carbonate with acids and see if any gas evolves; check also if gas gives a precipitate with quick lime.
When we add acid to carbonates and hydrogen carbonates of metal, bubbles start appearing from the carbonates. When we pass this air to a quick lime solution, it turns the lime water milky.
Carbonates and hydrogen carbonates of metal contain carbonate group CO3 in it. The metal forms its salt with acid and produces carbon dioxide gas and water.
Na2CO3(s) + 2HCl(aq) ——–> 2NaCl(aq) + H2O(l) + CO2(g)
NaHCO3(s) + HCl(aq) ——–> NaCl(aq) + H2O(l) + CO2(g)
Carbon dioxide reacts with lime turns the lime (Ca(OH)2) and forms calcium carbonate. Calcium carbonate is insoluble in water. Its power form makes water milky. Activity 1.4
Ca(OH)2(aq) + CO2(g) ——–> CaCO3(s) + H2O(l)
This experiment shows that all metal carbonates and metal hydrogencarbonates react with acids and form carbon dioxide.