The next three problems (4-6) refer to the following fractional precipitation ex

Question

The next three problems (4-6) refer to the following fractional precipitation experiment. Suppose a solution contains 0.25 M Cu'(aq) and 0.42 M Ag (aq). lodide ions, I, are then slowly added to the solution. 4. At what II] will Cul (s) start to precipitate? (Suggestion: Write the dissolving equation and Ksp expression for Cul before starting this problem.) a. 2.04x10-11 M b. 1.28x1012 M c. 8.16x1011 M d. 3.22x1016 M e. 5.81x10-13 M At what [I] will Agl (s) start to precipitate? (Suggestion: Write the dissolving equation and Kop expression for Agl before starting this problem.) 5. a. 4.2x10-17 M b. 2.38x1016 M c. 5.67x10-16 M d. 2.27x1015 M e. 1.11x10-12 M 6. Calculate the [Ag'] left in solution when Cu' starts to precipitate, and then answer the following questions. What percent of the original Ag is left in solution when Cut starts to precipitate? a. 0.0020% b. 0.0030% 0.00 12% 0.0 10% c. e. 0.00023% d.

Explanation / Answer

4) The Ksp of CuI is 1.1 X 10-12

The dissolution of CuI

CuI ---> Cu+ + I-

Ksp = [Cu+] [ I-]

1.27 X 10-12 = 0.25 X [I-]

[I-] =5.08 X 10-12 [The answer may vary as the Ksp value is different from different source / data]

2) Ksp of AgI is 1.5 x 10-16

AgI ---> Ag+ + I-

Ksp = [Ag+][ I-]

2.38 x 10-16 = 0.42 X [I-]

[I-] = 5.67 X 10-16

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