State the method used with reasons for drying and collecting ammonia g

1.	State the method used with reasons for drying and collecting ammonia gas.
Answer» Calcium oxide (quick lime) is used for drying ammonia. It is because, calcium oxide being basic in nature does not react chemically with ammonia. CaO + H₂O → Ca(OH)₂ Chemicals such as CaCl₂ (anhydrous), P₂O₅ and cone H₂SO₄ are not used for drying ammonia, because they react chemically with it as shown in the equation below : (i) CaCl₂ + 8NH₃ → CaCl₂.8NH₃ (ii) P₂O₅ + 3H₂O + 6NH₃→ 2(NH₄)₃PO₄ (iii) H₂SO₄ + 2NH₃ → (NH₄)₂SO₄ Ammonia is collected by downward displacement of air. Ammonia gas is highly soluble in water, as such it cannot be collected over water. Further, ammonia is lighter than air. As such ammonia is collected by downward displacement of air.

State the method used with reasons for drying and collecting ammonia gas.

Answer»

Calcium oxide (quick lime) is used for drying ammonia. It is because, calcium oxide being basic in nature does not react chemically with ammonia.

CaO + H₂O → Ca(OH)₂

Chemicals such as CaCl₂ (anhydrous), P₂O₅ and cone H₂SO₄ are not used for drying ammonia, because they react chemically with it as shown in the equation below :

(i) CaCl₂ + 8NH₃ → CaCl₂.8NH₃

(ii) P₂O₅ + 3H₂O + 6NH₃→ 2(NH₄)₃PO₄

(iii) H₂SO₄ + 2NH₃ → (NH₄)₂SO₄

Ammonia is collected by downward displacement of air. Ammonia gas is highly soluble in water, as such it cannot be collected over water. Further, ammonia is lighter than air. As such ammonia is collected by downward displacement of air.

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