Question

The diagram shows an apparatus for the laboratory preparation of hydrogen chloride.

(i) Identify A and B

(ii) Write the equation for the reaction.

(iii) How would you check whether or not the gas jar is filled with hydrogen chloride?

(iv) What does the method of collection tell you about the density of hydrogen chloride?

Answer 1

(i) A = Cone. Sulphuric acid. B = Sodium chloride.

(iii) Bring a glass rod dipped in ammonium hydroxide near the mouth of the gas jar, it forms dense white fumes of ammonium chloride. 

(iv) Collection of HCl ↑ by upward displacement of air proves that HCl ↑ is denser than air. It is 1-28 times heavier than air.