1. Total/Net Ionic Equations

2. In chemistry, we work with balanced chemical equations:
ex. sodium sulphate reacts with calcium chloride in a double displacement reaction to give you calcium sulphate and sodium chloride

3. Na2SO4(aq) + CaCl2(aq)  CaSO4(s) + 2NaCl(aq)
Recall…what happened to NaCl in water?
Soluble ionic compounds form an “ion soup”:

4. Total ionic equation
illustrates the separation of soluble ionic compounds into their respective ions
ex. balanced chemical equation:
Na2SO4(aq) + CaCl2(aq)  CaSO4(s) + 2NaCl(aq)
total ionic equation:
2 Na+(aq) + SO42-(aq) + Ca Cl- 
CaSO4(s) + 2Na+(aq) + 2 Cl-(aq)

5. Net ionic equation
shows only the ions involved in the chemical reaction
ex.
total ionic:
2 Na+(aq) + SO42-(aq) + Ca2+ + 2Cl- 
CaSO4(s) + 2Na+(aq) + 2 Cl-(aq)
net ionic:
SO42-(aq) + Ca2+  CaSO4(s)

6. ions that do not participate in the reaction are called “spectator ions”
ex. Na+, Cl-