1. Write what is in the purple boxes
Aqueous Solutions
Write what is in the purple boxes

2. Ionic Equations An aqueous solution is ions dissolved in water
When a soluble substance is dissolved in water, the substance often breaks into ions. This solution is said to be an aqueous solution.
Pb(NO3)2(aq)  Pb2+(aq) + 2NO3-(aq)
NaI(aq)  Na+(aq) + I-(aq)
An aqueous solution is ions dissolved in water

3. Ionic Equations Consider the reaction… What is really going on is…
Pb(NO3)2(aq) + 2NaI(aq)  PbI2(s) + 2NaNO3(aq)
What is really going on is…
Pb2+ + 2NO3- + 2Na+ + 2I-  PbI2(s) + 2Na+ + 2NO3-
Note that the Na+ ion and the NO3- ion are not reacting. They are said to be spectator ions.

4. Net Ionic Equations Pb2+ + NO3- + Na+ + 2I-  PbI2(s) + Na+ + NO3-
It is often useful to write an equation showing only the species that are actually reacting. This is called a net ionic equation. It does not show the spectator ions.
Pb2+ + NO3- + Na+ + 2I-  PbI2(s) + Na+ + NO3-
becomes….
Pb2+(aq) + 2I-(aq)  PbI2(s)

5. Precipitates
The solid formed from mixing two aqueous solutions is called the precipitate

6. To predict precipitates, use the Precipitation Diagram
A solid box means a solid forms

7. Examples NaOH(aq) + Cu(NO3)2(aq)  Na3PO4(aq) + Fe(NO3)3(aq) 
MgSO4(aq) + AgNO3(aq) 
KOH(aq) + NaNO3(aq) 