Question

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

Answer 1

This is a `"metathesis"`, partner exchange reaction, that results in the formation of an INSOLUBLE precipitate.

Explanation:

And how to find the physical state BUT by experiment?

`Pb(NO_3)_2(aq) + 2KI(aq) rarr PbI_2(s)darr + 2KNO_3(aq)`

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:

`Pb^(2+) + 2I^(-) rarr PbI_2(s)darr`

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