2. Sometimes when solutions are combined insoluble precipitates are formed. Solubility rules are used to identify precipitates and net ionic equations are used to eliminate spectator ions. Lead(II) acetate is combined with sodium bromide. Identify the precipitate and write the net ionic equation. Lead(II) bromide has low solubility Pb 2+ (aq) + Br 1- (aq)  PbBr 2 (s) Balance the equation 2 Write the complete balanced equation

3. Pb(C 2 H 3 O 2 ) 2 (aq) + NaBr(aq) PbBr 2 (s) + NaC 2 H 3 O 2 (aq) 2 2 Ionic Equation – break all aqueous substances into ions Pb 2+ (aq) + 2C 2 H 3 O 2 1- (aq) + 2Na 1+ (aq) + 2Br 1- (aq) PbBr 2 (s) + 2Na 1+ (aq) + 2C 2 H 3 O 2 1- (aq)

4. Pb(C 2 H 3 O 2 ) 2 (aq) + NaBr(aq) PbBr 2 (s) + NaC 2 H 3 O 2 (aq) 2 2 Net Ionic Equations – Cancel all spectator ions (ions common to both sides) Pb 2+ (aq) + 2C 2 H 3 O 2 1- (aq) + 2Na 1+ (aq) + 2Br 1- (aq) PbBr 2 (s) + 2Na 1+ (aq) + 2C 2 H 3 O 2 1- (aq)

5. Pb(C 2 H 3 O 2 ) 2 (aq) + NaBr(aq) PbBr 2 (s) + NaC 2 H 3 O 2 (aq) 2 2 Net Ionic Equations – Cancel all spectator ions (ions common to both sides) Pb 2+ (aq) + + 2Na 1+ (aq) + 2Br 1- (aq) PbBr 2 (s) + 2Na 1+ (aq) +

6. Pb(C 2 H 3 O 2 ) 2 (aq) + NaBr(aq) PbBr 2 (s) + NaC 2 H 3 O 2 (aq) 2 2 Net Ionic Equations – Cancel all spectator ions (ions common to both sides) Pb 2+ (aq) + + 2Br 1- (aq) PbBr 2 (s)

7. Pb(C 2 H 3 O 2 ) 2 (aq) + NaBr(aq) PbBr 2 (s) + NaC 2 H 3 O 2 (aq) 2 2 Net Ionic Equations – Cancel all spectator ions (ions common to both sides) Pb 2+ (aq) + 2Br 1- (aq)PbBr 2 (s)

8. Write 1)Balanced chemical equations 2)Ionic equations 3)Net Ionic equations for a)ammonium phosphate and magnesium iodide b)sodium sulfite and iron(II) phosphate c)barium hydroxide and copper(II) chloride d)lithium sulfate and strontium bromide e)calcium sulfide and aluminium acetate

9. Write 1)Balanced chemical equations 2)Ionic equations 3)Net Ionic equations for a)lithium carbonate and magnesium sulfide b)strontium acetate and potassium carbonate