Question

. (C) solid calcium oxide was taken in a container and water was added slowly to it
a. Write the observation
b. Write the chemical formula of the product formed
What happens when carbon dioxide gas is bubbled through lime water
a. In small amount
b. In excess.​

Answer 1

Answer:

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Explanation:

Following are the two observations:

(i) Calcium oxide (CaO) reacts vigorously with water to form slaked lime.

The container becomes hot because a large amount of heat is released during this reaction.

(ii) The product formed is slaked lime for which the chemical formula is Ca(OH)2

Cao + H20 = Ca(OH)2

When CO2 gas is bubbled through lime water :-

i)In small amount then the lime water turns milky due to formation of calcium carbonate. Reaction:  

Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l)  

The insoluble CaCO3 is the reason that the solution turns milky

ii)in excess amount then the milkiness of the lime water disappears due to formation of Calcium bicarbonate.