Question- A solution contains .036 M Cu2+ and .044 M Fe2+. a solution containg sulfide ions is added to selectively precipate one of the metal ions from the slution. At what concentration of sulfide ion will a precipate begin to form? what is the identity of the precipitate? Ksp (CuS)= 1.3X10^-36 Ksp (FeS)= 6.3X10^-18
Express your answer using two significant figures.