Chapter 18, Problem 41E

Kl(aq) is slowly added to a solution with $\left[{\text{Pb}}^{2+}\right]=\left[{\text{Ag}}^{\text{4}}\right]=0.10\text{M}\text{.}$ For ${\text{Pbl}}_{\text{2}}$ , ${\text{K}}_{10}=7.1\times {10}^{-2}$ ; for Agl $K_{10}=8.5\times {10}^{-17}$ .

1. Which precipitate should form first, ${\text{Pbl}}_{\text{2}}$or Agl?
2. Which $\left[{\text{l}}^{\text{-}}\right]$is required for the second cation to begin to precipitate?
3. What concentration of the first cation to precipitate remains in solution at the point at which the second cation begins to precipitate?
4. Can ${\text{Pb}}^{2+}\left(\text{aq}\right)$ and ${\text{Ag}}^{\text{+}}\left(\text{aq}\right)$be effectively separated by fractional precipitation of their iodides?