The solubility of metal sulphides in saturated solution of H 2 S {[H 2 S] = 0.1 M} can be represented by :
MS + 2H + 
M 2+ + H 2 S ; K eq = 
The value of K eq is given for few metal sulphides. If concentration of each metal ion in solution is 0.01 M, which metal sulphide(s) is/are selectively precipated at total [H + ] = 1 M in saturated H 2 S solution ?
Metal sulphide : MnS ZnS CoS PbS
K eq : 3 × 10 10 3 × 10 –2 3 3 × 10 –7
Text Solution
Verified by ExpertsCHECK THE SOLUTION.
For getting selectively precipitated, IP > K sp .
[M 2+ ] [S 2– ] > K sp
[M 2+ ] 
> K sp
> K eq ∴ 
> K eq
∴ K eq < 10 –3 .
For PbS, above condition is satisfied.
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