1. 8.5 NOTES Types of Reactions Double Replacement Net Ionics

2. b. Ionic Equations
i. Molecular equation
Pb(NO3)2(aq) + 2KI(aq)  PbI2(s) + 2KNO3(aq)

3. ii. Complete ionic equation to show rxn accurately, better to write ionic species as ions;
Pb+2(aq) + 2NO3-(aq) + 2K+(aq) + 2I- (aq)  PbI2(s) +2K+(aq) + 2NO3-(aq)

4. iii. Spectator ions ions that are not involved in the overall rxn
K+ and NO3-; appear on both sides of the reaction and are unchanged;
iv. Net ionic equation shows only the species that actually take part in the reaction
Pb+2(aq) + 2I-(aq)  PbI2(s)