Chemical and Ionic Equilibrium 2 Question 17

17. A solution which is 10−3M each in Mn2+,Fe2+,Zn2+ and Hg2+ is treated with 10−16M sulphide ion. If Ksp of MnS,FeS,ZnS and HgS are 10−15,10−23,10−20 and 10−54 respectively, which one will precipitate first?

(2003, 1M)

(a) FeS

(b) MgS

(c) HgS

(d) ZnS

Show Answer

Solution:

  1. Minimum S2− concentration would be required for precipitation of least soluble HgS.

For HgS,S2− required for precipitation is

[S2−]=Ksp[Hg2+]=10−5410−3=10−51M

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