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 solubilityPb2+

(aq) + Br1- (aq) PbBr2(s)Balance the equation

2

Write the complete balanced equation

Pb(C2H3O2)2(aq)+

NaBr(aq)

PbBr2(s) +

NaC2H3O2(aq) 2 2

Ionic Equation – break all aqueous substances into ions

Pb2+(aq) + 2C2H3O21-(aq)

+2Na1+(aq) + 2Br1-(aq)

PbBr2(s) +

2Na1+(aq) + 2C2H3O2

1-(aq)

Pb(C2H3O2)2(aq)+

NaBr(aq)

PbBr2(s) +

NaC2H3O2(aq) 2 2

Net Ionic Equations – Cancel all spectator ions (ions common to both sides)

Pb2+(aq) + 2C2H3O21-(aq)

+2Na1+(aq) + 2Br1-(aq)

PbBr2(s) +

2Na1+(aq) + 2C2H3O2

1-(aq)

Pb(C2H3O2)2(aq)+

NaBr(aq)

PbBr2(s) +

NaC2H3O2(aq) 2 2

Net Ionic Equations – Cancel all spectator ions (ions common to both sides)

Pb2+(aq) ++

2Na1+(aq) + 2Br1-(aq)

PbBr2(s) +

2Na1+(aq) +

Pb(C2H3O2)2(aq)+

NaBr(aq)

PbBr2(s) +

NaC2H3O2(aq) 2 2

Net Ionic Equations – Cancel all spectator ions (ions common to both sides)

Pb2+(aq) ++

2Br1-(aq)

PbBr2(s)

Pb(C2H3O2)2(aq)+

NaBr(aq)

PbBr2(s) +

NaC2H3O2(aq) 2 2

Net Ionic Equations – Cancel all spectator ions (ions common to both sides)

Pb2+(aq) + 2Br1-(aq) PbBr2(s)

Write1) Balanced chemical equations2) Ionic equations3) Net Ionic equations for

a) ammonium phosphate and magnesium iodideb) sodium sulfite and iron(II) phosphatec) barium hydroxide and copper(II) chlorided) lithium sulfate and strontium bromidee) calcium sulfide and aluminium acetate

Write1) Balanced chemical equations2) Ionic equations3) Net Ionic equations for

a) lithium carbonate and magnesium sulfideb) strontium acetate and potassium carbonate