Ncert Exercises & Solutions

Chemical A is used for the preparation of washing soda to recover ammonia. When CO₂ is bubbled through an aqueous solution of A, the solution turns milky. It is used in whitewashing due to its disinfectant nature. The chemical formula of A is-

1. $Ca {({HCO}_{3})}_{2}$

2. $CaO$

3. $Ca {(OH)}_{2}$

4. ${CaCO}_{3}$

Hint:

C O_{2}

turns calcium hydroxide solution milky

To recover NH₃ in the Solvay ammonia soda process Ca(OH)₂ is used. The reaction between calcium hydroxide and ammonium chloride is :

2 {NH}_{4} Cl + Ca {(OH)}_{2} \to 2 {NH}_{3} + {CaCl}_{2} + 2 H_{2} O

On passing CO₂ through Ca(OH)₂, it turns milky due to the formation of CaCO₃. The reaction is

Ca {(OH)}_{2} + {CO}_{2} \to {CaCO}_{3} ↓ + H_{2} O

Ca(OH)₂ is used for whitewashing.

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