Question

What is observed when a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube?

Answer 1

When a solution of potassium iodide(KI) is added to a solution of lead nitrate[Pb(NO₃)₂] it gives the formation of potassium nitrate(KNO₃) and a yellow precipitate of lead iodide(PbI₂) is observed at a bottom of a test tube.

Chemical reaction:

$2\mathrm{KI}\left(\mathrm{aq}\right)+\mathrm{Pb}{\left({\mathrm{NO}}_3\right)}_2\left(\mathrm{aq}\right)\to 2{\mathrm{KNO}}_3\left(\mathrm{aq}\right)+{\mathrm{PbI}}_2\left(\mathrm{s}\right)$

Therefore, a yellow precipitate of lead iodide is formed.