8.5 NOTES Types of Reactions Double Replacement Net Ionics

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8.5 NOTES Types of Reactions Double Replacement Net Ionics

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

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)

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)