A Mining Operation Needs to Separate Silver and Copper

question 123

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

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