Question

In the laboratory preparation of HCl frem sodium chloride, state why the following are preferred – 

1. Cone. H₂SO₄ as a reactant 

2. Temp, below 200°C 

3. Cone. H₂SO₄ as a drying agent. 

Answer 1

1. Since it is non-volatile and has a high boiling point. 

2. The glass apparatus does not crack, no hard crust is formed, fuel is not wasted. 

3. It only removes moisture content of the gas but not react with it.