Net Ionic Equations
 HW:
Net Ionic equations
worksheet
Net Ionic Equations
 Most
ionic compounds dissociate
completely into cations and
anions when they dissolve in
water.
 Written for double and single
replacement reactions
Net Ionic Equations
1.
Write the complete ionic equation
(includes all dissolved ionic
compounds as their free ions.)
Cl2 (g) + 2NaBr (aq) → Br2 (l) + 2NaCl (aq)
Complete Ionic Equations (step 1)
Cl2 (g) + 2NaBr (aq) → Br2 (l) +
2NaCl (aq)
Cl2 (g) + 2Na+(aq) + 2Br-(aq) →
Br2(l) + 2Na+(aq) + 2Cl-(aq)
Spectator ions (step 2)
 Spectator
ion: not directly
involved in a reaction. Appears
on both sides of the equation.
 In the previous problem, 2Na+(aq)
is the spectator ion.
Net ionic equation (step 3)
 Indicates
only the particles that
actually take part in the reaction.
Cl2(g) + 2Br-(aq) → Br2(l) + 2Cl-(aq)
 Make sure that the charges
balance on both sides of the
equation
Net Ionic Equation (Example)

Solutions of Lead(II) acetate and cupric
sulfate are mixed.
1.
Write the balanced equation
Write the complete ionic equation
Identify the spectator ions
Write the net ionic equation
2.
3.
4.
Balanced Equation
Pb(C2H3O2)2(aq) + CuSO4(aq) →
PbSO4(s) + Cu(C2H3O2)2(aq)
Complete Ionic Equation
Pb2+(aq) + 2C2H3O2-(aq) + Cu2+(aq) + SO42-(aq)→
PbSO4(s) + Cu2+(aq) + 2 C2H3O2-(aq)
Note: PbSO4 does not dissolve in
water!
Identify Spectator Ions
 2C2H3O2-(aq)
 Cu2+(aq)
Appear on both sides of the
equation
Net Ionic equation
 Eliminate
spectator ions
Pb2+(aq) + SO42-(aq) → PbSO4(s)
Note: zero net charge on reactant
side; zero net charge on product
side