3 Ionic equations

Writing Ionic equations We usually write ionic equations to show the key changes in a reaction. Ionic equations only show the ions that are reacting and leave out spectator ions. Spectator ions are ions that are not • Not changing state • Not changing oxidation number Pb(NO3 )2 (aq) + 2NaCl (aq)  PbCl2 (s) + 2 NaNO3 Take full equation (aq) Separate (aq) solutions into ions Pb2+ (aq) + 2NO3 – (aq) + 2Na+ (aq)+ 2Cl- (aq)  PbCl2 (s) + 2 Na+ (aq)+ 2NO3 – (aq) Cancel out spectator ions leaving ionic equation Pb2+ (aq) + 2Cl- (aq)  PbCl2 (s)