Question

Compound A when dissolved in water gives compound B which is used in white washing. Compound B reacts with carbon dioxide to form a white precipitate of compound C . Identify compounds A ,B and C . Also write the equations involved.

Answer 1

Compound A when dissolved in water gives compound B which is used in white washing. Compound B reacts with carbon dioxide to form a white precipitate of compound C . Identify compounds A ,B and C . Also write the equations involved.

a. Calcium oxide

b. calcium hydroxide

c. calcium carbonate

CaO + H2O -----> CaOH

CaOH + CO2 -----> CaCO3

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Answer 2

Compound A reacts with water and gives compound B which is used in whitewashing.

Compound A + water → Compound B (used in white washing)

The substance used for white washing is CaO (Calcium Oxide).

Therefore, compound A is Calcium oxide having formula CaO.

$\sf{CaO+H_2O\rightarrow Ca(OH)_2}$

So, compound B is Calcium Hydroxide (another name - Slaked lime) having formula Ca(OH)2.

The above reaction is an example of a Combination Reaction. Because in it two or more reactants combine to form a single product.

Now, compound B reacts with carbon dioxide to form a white precipitate of compound C.

Compound B + Carbon dioxide → Compound C (which forms white precipitate)

$\sf{Ca(OH)_2+CO_2\rightarrow CaCO_3+H_2O}$

Therefore, compound C is Calcium Carbonate.

The above reaction is an example of a Double Displacement Reaction. Because the exchange of ions takes place. Also, known as Precipitation Reaction, as the formation of precipitate takes place.