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Question

Suppose hydrogen sulfide is added to a solution that is 0.0010 Min 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 x10"20

SaltKsp
FeS6.0 x10-18
CdS8.0 x10-27
CoS4.0 x10-21
MnS2.5 x10-10

A) CdS only
B) CdS, CoS, FeS, and MnS
C) CdS, CoS, and FeS
D) CdS and FeS
E) CdS and CoS

Answer

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