Describe an experiment to prove the following:
(i) HCl gas is heavier than air.
(ii) HCl gas is highly soluble in water.
(iii) HCl gas contains the element chlorine.
|Fill two jars A and B with air and HCl gas, respectively. Invert the jar containing HCl gas over the jar containing air. After some time, separate the jars and bring a glass rod dipped in ammonium hydroxide solution inside jar A.||Dense white fumes of ammonium chloride||HCl gas displaces the air from the jar as it is heavier than air.|
(ii) Experiment to prove that HCl gas is highly soluble in water:
|Fill dry HCl gas in a round-bottomed flask. Close the openings of the flask with rubber corks. Insert a jet tube through one of the holes. Through the second hole, insert a dropper filled with water. Close the open end of the jet tube and dip it in a blue litmus solution. Invert the flask and press the dropper.||The blue litmus solution enters the jet tube and forms a red fountain.||HCl gas is highly soluble in water.|
(iii) Experiment to prove that HCl gas contains chlorine:
Hydrogen chloride reacts with strong oxidising agents (like MnO2, Pb3O4 , etc.) to release chlorine gas, which is greenish yellow in colour with a pungent smell.
Release of chlorine gas:
MnO2(s) + 4HCl(aq) → MnCl2(aq) + 2H2O(l) + Cl2(g)