The chemical equation for the reaction between potassium and lead nitrate to form lead is:

2K(s) + Pb(NO₃)₂(aq) → 2KNO₃(aq) + Pb(s)

Here's what happens:

* Potassium (K) is a very reactive metal.

* Lead nitrate (Pb(NO₃)₂) is a soluble salt.

* Potassium nitrate (KNO₃) is also a soluble salt.

* Lead (Pb) is a less reactive metal and precipitates out of solution.

Explanation:

This is a single displacement reaction. The more reactive potassium displaces the less reactive lead from the lead nitrate solution. The potassium reacts with the nitrate ions to form potassium nitrate, which dissolves in water. The lead metal is then left behind as a solid precipitate.