A Solution Contains 0

question 15

Multiple Choice

A solution contains 0.021 mol L^-1 Cl^- and 0.017 mol L^-1 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? K_sp(CuCl) = 1.0 × 10^-6,K_sp(CuI) = 5.1 × 10^-12.

• A)3.0 × 10^-10 mol L^-1,CuI
• B)3.0 × 10^-10 mol L^-1,CuCl
• C)4.8 × 10^-5 mol L^-1,CuCl
• D)4.8 × 10^-5 mol L^-1,CuI
• E)3.0 × 10^-5 mol L^-1,both CuCl and CuI are in the precipitate

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