The net ionic equation for the reaction between KCl (aq) and Pb(NO3)2 (aq) to form KNO3 (aq) and PbCl2 (s) is:

Pb2+ (aq) + 2 Cl- (aq) → PbCl2 (s)

This equation shows that the only ions that participate in the reaction are Pb2+ and Cl-. The K+ and NO3- ions are spectator ions and do not participate in the reaction.