A Mining Operation Needs to Separate Silver and Copper

Multiple Choice

A mining operation needs to separate silver and copper. You are hired as a summer intern in a beautiful Colorado mining town, and one of your tasks is to determine whether this separation can be accomplished by oxidizing the metals to Ag^ and Cu^, each one at a concentration of 0.15 M, and then precipitating one as the chloride salt without precipitating the other. AgCl precipitates first. What is the concentration of the Ag^ remaining in solution when CuCl begins to precipitate? For AgCl, pK_sp  9.74, and for CuCl, pK_sp  6.76.

A) 1.57  10^2 M
B) 1.57  10^4 M
C) 2.23  10^2 M
D) 2.23  10^4 M
E) 3.72  10^3 M