A solution which is 10−3M each in Mn2+,Fe2+ and Hg2+ is treated with 10−16M sulphide ion, If Ksp of MnS,FeS,ZnSandHgS are 10−15,10−25,10−20 and 10−54 respectively, which one will precipitate first?
A
FeS
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B
MnS
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C
HgS
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D
ZnS
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Solution
The correct option is CHgS Ionic product of the solution =10−3×10−16=10−19.
The metal sulphide having the lowest solubility will precipitate first provided the ionic product is higher than the Ksp.
Here, all salts are of the same valence type. So, the sulphide having the lowest Ksp value will precipitate first provided Ksp10−19. HgS has the lowest Ksp value (10−54) so it will precipitate first.