A solution contains 1.1×10-4 M Cu* and 3.5×103 M Pb²+. If a source of I' is added gradually to this solution, which will precipitate first, Pbl2(Ksp= 1.4 × 10-8) or CuI (Ksp= 5.3 x 10-12)? Specify the concentration of I' necessary to begin the precipitation of each salt. HOW DO WE GET THERE? For each potential precipitate, write the Ken expression and use the initial concentration of metal to solve for [I]. What is the concentration of I at the point when Cul begins to precipitate?

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### Solubility and Precipitation Problem

A solution contains \(1.1 \times 10^{-4} \, \text{M} \, \text{Cu}^{2+}\) and \(3.5 \times 10^{-3} \, \text{M} \, \text{Pb}^{2+}\). If a source of \(\text{I}^-\) is added gradually to this solution, which will precipitate first, \(\text{PbI}_2\) (\(K_{sp} = 1.4 \times 10^{-8}\)) or \(\text{CuI}\) (\(K_{sp} = 5.3 \times 10^{-12}\))? Specify the concentration of \(\text{I}^-\) necessary to begin the precipitation of each salt.

#### How Do We Get There?

For each potential precipitate, write the \(K_{sp}\) expression and use the initial concentration of metal to solve for \([\text{I}^-]\). What is the concentration of \(\text{I}^-\) at the point when \(\text{CuI}\) begins to precipitate?

\[ [\text{I}^-] = \]

\[ \boxed{5.3 \times 10^{-12} \, \text{M}} \]

**Explanation:**

- The box provided is for input, indicating the answer was expected to be \( \boxed{5.3 \times 10^{-12} \, \text{M}} \), but it seems to be incorrect. Calculation should be revisited to correctly find the concentration of \([\text{I}^-]\) for the other scenarios.
Transcribed Image Text:### Solubility and Precipitation Problem A solution contains \(1.1 \times 10^{-4} \, \text{M} \, \text{Cu}^{2+}\) and \(3.5 \times 10^{-3} \, \text{M} \, \text{Pb}^{2+}\). If a source of \(\text{I}^-\) is added gradually to this solution, which will precipitate first, \(\text{PbI}_2\) (\(K_{sp} = 1.4 \times 10^{-8}\)) or \(\text{CuI}\) (\(K_{sp} = 5.3 \times 10^{-12}\))? Specify the concentration of \(\text{I}^-\) necessary to begin the precipitation of each salt. #### How Do We Get There? For each potential precipitate, write the \(K_{sp}\) expression and use the initial concentration of metal to solve for \([\text{I}^-]\). What is the concentration of \(\text{I}^-\) at the point when \(\text{CuI}\) begins to precipitate? \[ [\text{I}^-] = \] \[ \boxed{5.3 \times 10^{-12} \, \text{M}} \] **Explanation:** - The box provided is for input, indicating the answer was expected to be \( \boxed{5.3 \times 10^{-12} \, \text{M}} \), but it seems to be incorrect. Calculation should be revisited to correctly find the concentration of \([\text{I}^-]\) for the other scenarios.
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