Question

In the laboratory preparation of hydrochloric acid, \[\ce{HCl}\] gas is dissolved in water.

1. Draw a diagram to show the arrangement used for the absorption of \[\ce{HCl}\] 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 \[\ce{HCl}\] gas when the reactants are:
   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 \[\ce{HCl}\] gas.

iii.

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