18. Aqueous Equilibrium - Part 1 of 3
18. Aqueous Equilibrium / Precipitation: Ksp vs Q / Problem 11
Based on the quantitative analysis, the addition of H2S can separate Pb2+, Cu2+, and Cd2+ from other cations present in a solution. What is the S2− ion concentration needed to start the precipitation of (i) Pb2+, (ii) Cu2+, and (iii) Cd2+ ions if each of the metal ions has a concentration of 0.020 M? When Cu2+ starts to precipitate, what fraction of Cd2+ is still left in the solution?
Ksp PbS = 7.0×10−29, Ksp CuS = 8.0×10−37, Ksp CdS = 1.0×10−28
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