# How do we represent the reaction of potassium iodide with lead nitrate in aqueous solution?

Mar 7, 2017

This is a $\text{metathesis}$, partner exchange reaction, that results in the formation of an INSOLUBLE precipitate.

#### Explanation:

And how to find the physical state BUT by experiment?

$P b {\left(N {O}_{3}\right)}_{2} \left(a q\right) + 2 K I \left(a q\right) \rightarrow P b {I}_{2} \left(s\right) \downarrow + 2 K N {O}_{3} \left(a q\right)$

Perform the reaction and you observe a canary yellow precipitate of lead iodide, which is quite insoluble in aqueous solution.

The net ionic equation is:

$P {b}^{2 +} + 2 {I}^{-} \rightarrow P b {I}_{2} \left(s\right) \downarrow$

This is a good qualitative test for the presence of iodide ions.