Question

In the laboratory preparation of hydrochloric acid, hydrogen chloride gas is dissolved in water.
(i) Draw a diagram to show the arrangement used for the absorption of HCl gas in water.
(ii) State why such an arrangement is necessary? Give two reasons for the same.
(iii) Write balanced chemical equations for the laboratory preparation of HCl gas when the reactants are :
(A) below 200°C
(B) above 200°C

August 22, 2024

Answer

(i) Below diagrams show the special funnel arrangement used for the absorption of HCl gas in water:

(ii) The reasons are :

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

(iii) The equations are:

(a) NaCl + H₂SO₄ ${\overset{ < 200^oC}{\longrightarrow}}$ NaHSO₄ + HCl (g)

(b) NaCl + H₂SO₄ ${\overset{ > 200^oC}{\longrightarrow}}$ Na₂SO₄ + HCl (g)

💡 Some Related Questions

Identify the gas evolved and give the chemical test when dilute hydrochloric acid reacts with :
(i) Sodium sulphite.
(ii) Iron [II] sulphide.

State your observations when dilute hydrochloric acid is added to :
(i) Lead nitrate soln. and the mixture is heated.
(ii) Copper carbonate.
(iii) Sodium thiosulphate.

Write balanced chemical equation for : Action of hydrochloric acid on sodium bicarbonate.

Fill in the blank : ……………[AgCl / PbCl2], a white precipitate is soluble in excess NH4OH.

Select the correct answer from A, B, C and D : The aim of the Fountain experiment is to prove that :
(A) HCl turns blue litmus red
(B) HCl is denser than air
(C) HCl is highly soluble in water
(D) HCl fumes in moist air.

The following questions pertain to the laboratory preparation of hydrogen chloride gas:
(i) Write the equation for it’s preparation mentioning the condition required.
(ii) Name the drying agent used in the above preparation and give a reason for the choice.
(iii) State a safety precaution taken during the preparation of hydrochloric acid.

Identify the acid which on mixing with AgNO3 soln. gives a white precipitate, soluble in excess ammonium hydroxide.

Select from the gases — ammonia, ethane, hydrogen chloride, hydrogen sulphide, ethyne — The gas which produces dense white fumes with ammonia gas.

Study the figure given below and answer the questions that follow :

(i) Identify the gas Y.
(ii) What property of gas Y does this experiment demonstrate?
(iii) Name another gas which has the same property and can be demonstrated through this experiment.

State your observation: Dilute HCl is added to sodium carbonate crystals.