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Question

Suppose hydrogen sulfide is added to a solution that is 0.10 M in Cu2+, Pb2+, and Ni2+such that the concentration of H2S is 0.10 M. When the pH of the solution is adjusted to 1.00, a precipitate forms. What is the composition of the precipitate?
H2S(aq) + 2H2O(l) 2H3O+(aq) + S2-(aq); Kc= 1.1 x10-20

SaltKsp
CuS6.0 x10-36
PbS2.5 x10-27
NiS3.0 x10-19

A) CuS only
B) PbS and NiS
C) CuS and PbS
D) NiS only
E) CuS, PbS, and NiS

Answer

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