# In an experiment, solid lead iodide is produced in a mixture with a solution of a soluble salt. How can a pure, dry sample of solid lead iodide can be obtained from this mixture?

Jan 24, 2016

$P b {\left(N {O}_{3}\right)}_{2} + 2 {I}^{-} \rightarrow P b {I}_{2} \left(s\right) \downarrow + 2 N {O}_{3}^{-}$
Lead halides are VERY insoluble. When halide ion is added to a solution of a soluble lead salt (say $P b {\left(N {O}_{3}\right)}_{2}$ or Pb[(O(O=)C-CH_3]_2, a precipitate of $P b {X}_{2}$ occurs. Lead halides are very insoluble, and MOST of the $P {b}^{2 +}$ is present in the precipitate.