CuI ==> Cu^+ + 2^-
Ksp = (Cu^+)(I^-)
You know Ksp, you know I^-, you're left with only one unknown; i.e., (Cu^+). Solve for that.
Solid Nal is slowly added to a solution that is .0040 M in Cu^+. Calculate the [I-] when CuI just begins to precipitate from the solution.
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