Activity 2.5 NCERT Class 10 Science, Acids, Bases and Salts

Activity 2.5 NCERT Class 10 Science, Chapter 2 Acids, Bases, and Salts.

Procedure:

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.

Observation:

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.

Explanation:

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)

activity 2.5 science class 10

Inference/conclusion:

This experiment shows that all metal carbonates and metal hydrogencarbonates react with acids and form carbon dioxide.

Next: How to use PH indicator to know the completion of a reaction, Activity 2.6

See also:

The reaction of zinc with a base. Activity 2.4.

 

 

 

Other activities from NCERT class 10 science Chapter 2.

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