Question

What happens when potassium iodide solution is mixed with lead nitrate solution? Write balanced chemical equations to support your answer.

Answer 1

When potassium iodide (KI) solution is mixed with lead nitrate Pb(NO₃)₂ solution, a yellow precipitate of lead iodide (PbI₂) is formed.

\[\ce{Pb(NO3)2_{(aq)} + 2KI_{(aq)} -> PbI2_{(s)} + 2KNO3_{(aq)}}\]

This is a double displacement reaction in which insoluble lead iodide (yellow precipitate) is formed.