Multiple Choice
Suppose hydrogen sulfide is added to a solution that is 0.0010 M in Fe2+,Cd2+,Co2+,and Mn2+ such that the concentration of H2S is 0.10 M.When the pH of the solution is adjusted to 3,a precipitate forms.What is the composition of the precipitate?
H2S(aq) + 2H2O(l) 
2H3O+(aq) + S2-(aq) ; Kc = 1.1 × 10-20
Salt
Ksp
FeS
6) 0 × 10-18
CdS
8) 0 × 10-27
CoS
4) 0 × 10-21
MnS
2) 5 × 10-10
A) CdS only
B) CdS,CoS,FeS,and MnS
C) CdS,CoS,and FeS
D) CdS and FeS
E) CdS and CoS
Correct Answer:
Verified
Correct Answer:
Verified
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