Reactions in Reactions in Aqueous Aqueous Solution:Solution:

Double Replacement Double Replacement ReactionsReactions

• AB + CD AB + CD AD + CB AD + CB

A Precipitation ReactionA Precipitation Reaction

NaI(aq) + Pb(NO3)2(aq) NaNO3(aq) + PbI2(s)

NaI(aq) + Pb(NO3)2(aq) NaNO3(aq) + PbI2(s)

NaI(aq) + Pb(NO3)2(aq) NaNO3(aq) + PbI2(s)

Balance the formula equation.Write the total ionic equation.Write the net ionic equation.

Precipitation ReactionsPrecipitation ReactionsPrecipitate – insoluble solid that separates from solution

net ionic equation

Pb2+ + 2NO3- + 2Na+ + 2I- PbI2 (s) + 2Na+ + 2NO3

-

Na+ and NO3- are spectator ions

Pb(NO3)2 (aq) + 2NaI (aq) PbI2 (s) + 2NaNO3 (aq)

precipitate

Pb2+ + 2I- PbI2 (s)“If you’re not a part of

the solution, then you’re a part of the precipitate!”

Writing Net Ionic EquationsWriting Net Ionic Equations1. Write the balanced formula equation.

2. Write the total ionic equation.

3. Cancel the spectator ions on both sides of the ionic equation.

4. Write the net ionic equation.

AgNO3 (aq) + NaCl (aq) AgCl (s) + NaNO3 (aq)

Ag+ + NO3- + Na+ + Cl- AgCl (s) + Na+ + NO3

-

Ag+ + Cl- AgCl (s)

Write the net ionic equation for the reaction of silver nitrate with sodium chloride.

Write the balanced formula equation for this double replacement reaction.

Write the net ionic equation for the reaction.

Write the balanced formula equation for this double replacement reaction.

Write the net ionic equation for the reaction.

Solubility Rules

Gravimetric Analysis-

A quantitative analysis of a double replacement reaction

The solid produced in the reaction is isolated by filtering and rinsing. After the filter and solid are dried, the mass of the barium sulfate is measured.

Another double replacement Another double replacement reaction: reaction:

Formation of WaterFormation of Water Mixing an acid and baseMixing an acid and base

And yet another double And yet another double replacement reactionreplacement reaction

Ba(OH)Ba(OH)22(aq) + H(aq) + H22SOSO44(aq) (aq)

H2O

Ions in solution are dissociated attracted to the water by ion-dipole attractions. While ions in the precipitate held in fixed positions by ionic bonds between the ions

Try this one!Try this one!Write the formula, total ionic, and net ionic Write the formula, total ionic, and net ionic equations for this reaction: Silver nitrate equations for this reaction: Silver nitrate reacts with Lead (II) Chloride in hot water.reacts with Lead (II) Chloride in hot water.

Formula: Formula:

Total Ionic:Total Ionic:

Net Ionic:Net Ionic: