Describe the method of preparation of hydrogen sulphide using Kipp’s apparatus.

Describe the method of preparation of hydrogen sulphide using Kipp’s apparatus. OR
Explain the working of Kipp’s apparatus. OR
Draw a neat labelled diagram of Kipp’s apparatus and describe its working.
Ans.
Construction: - Kipp’s apparatus consists of three globes. The upper globe (A) consists of a long tapering tube at the bottom. The middle and the lower two globes (B and C) are connected with a narrow collar. The upper globe is fitted in the lower globe as shown in the figure.





Working: - Iron sulphide pieces are taken in globe B and dilute hydrochloric acid poured in globe A. When the stopcock D is opened, the acid runs down into globe C and rises up into iron sulphide. The reaction takes place and hydrogen sulphide gas is liberated. When the stopcock is closed, the gas is unable to escape pressure; the acid is pushed down in globe C and loses contact with iron sulphide. The reaction stops and hydrogen sulphide is not formed. Thus, the gas can be generated as and when required. 

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