Question

In the laboratory preparation of hydrochloric acid, HCl gas is dissolved in water.

1. Draw a diagram to show the arrangement used for the absorption of HCl gas in water.
   
2. State why such an arrangement is necessary? Give two reasons for the same.
3. Write the chemical equation for the laboratory preparation of HCl gas when the reaction is:
   1. Below 200°C
   2. Above 200°C

Answer 1

i. 

ii. Two reasons for the use of funnel arrangements are:

1. Prevents or minimizes back-suction of water.
2. Provides a large surface area for absorption of HCl gas.

iii.

1. \[\ce{NaCl + H2SO4 ->[below 200^\circ C] NaHSO4 + HCl ^}\]
2. \[\ce{2NaCl + H2SO4 ->[above 200^\circ C] Na2SO4 + 2HCl}\]