Explain about hydrogen sulphide, Chemistry

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Q. Explain about Hydrogen Sulphide?

Hydrogen sulphide is the only thermodynamically stable sulphane. It is a foul smelling and poisonous gas.

H2S is prepared in the laboratory by treating FeS with dilute HCI in Kipp's apparatus. In aqueous solution H, S is a weak acid. At 293 K, it dissociates as shown below: 

740_Hydrogen Sulphide.png

You must have used H2S in qualitative identification and separation of cations. This separation is based on selective precipitation of the sulphides in acidic and alkaline medium:  In the acidic medium, the ionisation of H2S which is a weak acid, is further suppressed and the solubility product of sulphides of relatively less soluble cations of Group 11, namely.  Pb2+, Hg2+, Bi3+, Cu2+ , Cd2+ . As3+, Sb3+, Sn+2 is exceeded:

1988_Hydrogen Sulphide1.png

In Group IV, in the presence of ammonia, a higher concentration of S2- ions is obtained leading to the precipitation of the more soluble sulphides of Zn, Mn, Ni and Co.

73_Hydrogen Sulphide2.png


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