class 10 science activity 2.5
Answers
It covers different segments. The atomic sizes of elements decrease the left to right in the period and also increased the top to bottom generally in the group.
The metallic character rises down the group as well as decreases from left to right.
The non-metallic character increases completely going from the left to right direction in the period.
Activity 2.5 NCERT Class 10 Science, 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.
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) + 2HCl(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.
Ca(OH)2(aq) + CO2(g) ——–> CaCO3(s) + H2O(l)
Conclusion:
This experiment shows that all metal carbonates and metal hydrogencarbonates react with acids and form carbon dioxide.