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A solution contains 0.036 M Cu2+ and 0.044 Fe2+. A solution containing sulfide ions is added to selectively precipitate one of the metal ions from solution. At what concentration of sulfide ion will a precipitate begin to form? What is the identity of the precipitate?
Ksp(CuS)= 1.3 x 10-36 Ksp (FeS)=6.3 x 10-18

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