# Problem: A solution contains 0.021 M Cl- and 0.017 M I -. A solution containing copper (I) ions is added to selectively precipitate one of the ions. At what concentration of copper (I) ion will a precipitate begin to form? What is the identity of the precipitate? Ksp(CuCl) = 1.0 × 10 -6 Ksp(CuI) = 5.1 × 10 -12 A) 4.8 × 10-5 M, CuI B) 3.0 × 10-10 M, CuCl C) 4.8 × 10-5 M, CuCl D) 3.0 × 10-10 M, CuI E) No precipitate will form at any concentration of copper (I).

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A solution contains 0.021 M Cl- and 0.017 M I -. A solution containing copper (I) ions is added to selectively precipitate one of the ions. At what concentration of copper (I) ion will a precipitate begin to form? What is the identity of the precipitate?

Ksp(CuCl) = 1.0 × 10 -6
Ksp(CuI) = 5.1 × 10 -12

A) 4.8 × 10-5 M, CuI

B) 3.0 × 10-10 M, CuCl

C) 4.8 × 10-5 M, CuCl

D) 3.0 × 10-10 M, CuI

E) No precipitate will form at any concentration of copper (I).

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Selective Precipitation concept. If you need more Selective Precipitation practice, you can also practice Selective Precipitation practice problems.

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