1. Net Ionics
Tutorial II

2. General Information
Chemical equation in which only those ions undergoing chemical changes in the course of the reaction are represented
There is always a conservation of charge as well as mass in a balanced chemical equation.

3. Different Reactions Exchange Reactions Precipitation Reactions
Gas-Forming Reactions
Acid-Base Reactions

4. Exchange Reaction Metathesis or double displacement reactions
Interchange of reactant cation/anion partners
AB + XY AY + XB

5. Precipitation Reactions
Produce an insoluble precipitate from soluble reactants.
Cu(No3) 2(aq) + (NH4 )2S(aq) CuS(s) + 2 NH4NO3(aq)
Cu+2 (aq) + S-2 (aq) CuS(s)

6. Gas Forming Reactions
Exchange reaction occurring between metal carbonates and acids.
CuCO3(s) + 2 HNO3(aq) Cu(NO3)2(aq) + CO2(g) + H2O(l)
CuCo3(s) + 2 H3O+(aq) Cu+2 (aq) + CO2(g) + 3 H2O(l)

7. Acid Base Reactions
An exchange reaction between an acid and a base produces a salt, and usually, water.
NaOH(aq) + HCl(aq) NaCl(aq) + HOH(l)

8. Now that you know a little about Net Ionic Equations and how they work, lets start!
Mix lead(II) nitrate with hydrochloric acid to form lead(II) chloride and nitric acid

9. Which equation is correct?
Pb(NO2)3 (aq) + 2 HCl (aq) PbCl2 (s) + 2 HNO3 (aq)
Pb(NO2)3 (aq) + 2 HCl (aq) Pb2Cl2 (s) + 3 HNO3 (aq)
Pb(NO3)2 (aq) + 2 HCl (aq) PbCl2 (s) + 2 HNO3 (aq)

10. Incorrect!

11. Correct! Put this equation in dissociated form.
Pb(NO3)2 (aq) + 2HCl(aq)       PbCl2 (s) HNO3 (aq)

12. Which one is the correct Dissociated form?
Pb2+(aq) + 2 NO3-2(aq) + 1 H+(aq) + 2 Cl-(aq) PbCl3 (s) + 2 H+(aq) + 2 NO3-(aq)
Pb2+(aq) + 2 NO3-(aq) + 2 H+(aq) + 2 Cl-(aq) PbCl2 (s) + 2 H+(aq) + 2 NO3-(aq)
Pb2-(aq) + 2 NO3-(aq) + 2 H+(aq) + 3 Cl-(aq) PbCl2 (s) + 2 H+(aq) + 2 NO4-(aq)

13. Wrong!!!!!

14. Next, cancel out the ions that are not needed in the reaction.
Great Job!
Next, cancel out the ions that are not needed in the reaction.
Pb2+(aq) + 2 NO3-(aq) + 2 H+(aq) + 2 Cl-(aq) PbCl2 (s) + 2 H+(aq) + 2 NO3-(aq)

15. Which equation correctly cancels out the unneeded ions?
Pb2+(aq) + 2 Cl-(aq) PbCl2 (s)
Pb2+(aq) + 3 Cl-(aq) PbCl3 (s)
Pb3+(aq) + 1 Cl-(aq) PbCl3 (s)

16. Nope!

17. Yea! You Did It!