1. Net Ionic Equations

2. Net-ionic Equations
Net ionic equations are useful in that they show only those chemical species directly participating in a chemical reaction
The keys to being able to write net ionic equations are the ability to recognize monatomic and polyatomic ions, the solubility rules, and the rules for electrolyte behavior.

3. Net ionic equations Complete ionic equations
An ionic equation that shows all of the particles in a solution as they realistically exist
2 Na+ (aq) + 2OH- (aq) + Cu+2 (aq) + 2Cl- (aq) 
2 Na + (aq) + 2 Cl- (aq) + Cu(OH)2 (s)
Note that the sodium ions and the chloride ions are both reactants and products, therefore they do not participate in the reaction
Ions that do not participate in the reaction are called spectator ions

4. Net-ionic Equations
Ionic equations that include only the particles that participate in the reaction are called net ionic equations
Net ionic equations are written form complete ionic equations by crossing out all spectator ions
Example:
2 Na+ (aq) + 2OH- (aq) + Cu+2 (aq) + 2Cl- (aq) 
2 Na + (aq) + 2 Cl- (aq) + Cu(OH)2 (s)

5. Net-ionic Equations
A net ionic equation is what remains after the sodium and chloride ions are crossed out of this complete ionic equation
2OH- (aq) + Cu +2 (aq)  Cu(OH)2
Only the hydroxide and copper ions are left in the net ionic equation shown above

6. Example:
Write the chemical, complete ionic, and net ionic equations for the rxn between aqueous solutions of barium nitrate and sodium carbonate that forms the precipitate barium carbonate.
Complete Ionic Equation:
Ba(NO3)2 (aq) + Na2CO3 (aq)  BaCO3 (s) + NaNO3 (aq)
Balance the equation above:
Ba(NO3)2(aq) + Na2CO3 (aq) + BaCO3 (s) + 2 NaNO3 (aq)

7. Example continued: Show the ionic states of the reactants and products
Ba+2 (aq) + 2NO3- (aq) + 2Na+ + CO3-2 (aq) 
BaCO3 (s) + 2 Na+ (aq) + 2NO3- (aq)
Cross out the spectator ions from the complete ionic equation:

8. Example continued: The net ionic equation is:
Ba+2 (aq) + CO3-2 (aq)  BaCO3 (s)

9. Practice
Work on problems on pg. 294 of your chemistry book