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).

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