1. Net Ionic Equations

2. E.g. Sr(NO3)2(aq) → Sr2+(aq) + 2NO3-(aq)
Net Ionic Equations
In aqueous solutions, ionic compounds dissociate into their ions.
E.g. Sr(NO3)2(aq) → Sr2+(aq) + 2NO3-(aq)
Total ionic equations show all dissociated ions of soluble ionic compounds.
Spectator ions are ions that remain in solution and therefore are not involved in a chemical reaction.
Net ionic equations show only ions involved in a chemical reaction (I.e. spectator ions are NOT included)

3. An Example
The reaction between aqueous sodium chloride & silver nitrate.
Chemical Equation:
NaCl(aq) + AgNO3(aq)  NaNO3(aq) + AgCl(s)
Total Ionic Equation:
Na+(aq) + Cl-(aq) + Ag+(aq) + NO3-(aq)  Na+(aq) + NO3-(aq) + AgCl(s)
Net ionic Equation:
Ag+(aq) + Cl-(aq)  AgCl(s)

4. Another Example Chemical Equation:
The reaction between aqueous sodium chloride & magnesium nitrate.
Chemical Equation:
2 NaCl(aq) + Mg(NO3)2(aq)  2 NaNO3(aq) + MgCl2(aq)
Total Ionic Equation:
2Na+(aq) + 2Cl-(aq) + Mg2+(aq) + 2NO3-(aq)  2Na+(aq) + 2NO3-(aq) + Mg2+(aq) + 2Cl-(aq)
Net ionic Equation: No reaction!

5. Practice
p. 335 #3-7
p. 336 #1-3