1. Net Ionic Equations

2. How do we write chemical equations?
Potassium chloride reacts with Sodium fluoride to produce potassium fluoride and sodium chloride.

3. 3 Forms of Chemical Equations
Molecular
Form you are most familiar with
Reactants and products written as neutral compounds
Ex. KCl + NaF  NaCl KF

4. Chemical Equations (cont. )
2) Full Ionic
All chemical compounds are written as ions if they can be (ex. Strong electrolytes, strong acids, strong bases, etc.)
Soluble compounds—dissociate into ions
Insoluble compounds—solid precipitate
USE SOLUBILITY RULES!!!
Ex. Ba Cl Na SO4-2  BaSO4 (s) + 2Na Cl-
Barium sulfate insoluble so present in chemical equation as solid

5. How do we write a FULL IONIC equation?
Insoluble compounds are written as SOLIDS
Pure liquids and gases are written as is, not broken up into ions, electrically neutral.
Which compounds are broken up into ions????
Soluble ionic compounds
Strong acids (HCl, HBr, HI, HNO3 , HClO4 , H2SO4)
Strong Bases ( Group IA bases and Ca(OH)2, Sr(OH)2 , Ba(OH)2

6. Ex 1. Na2CrO4 + Pb(NO3)2 PbCrO4 + 2NaNO3
Write the full ionic equation.
2Na CrO Pb NO PbCrO4 (s) Na NO3-

7. Ex. 2: 2CH3CO2H + Sr(OH)2  Sr(CH3CO2)2 + 2H2O
Write the full ionic equation
2CH3CO2H Sr OH Sr CH3CO H2O

8. Forms of Chemical Equations (cont.)
3) Net Ionic Equations
Next step after full ionic equation.
Elimination of Spectator Ions (ions found on both sides of the equation, not changed with reaction)
Includes chemical compounds and ions DIRECTLY involved in chemical reaction.

9. From Example 1:
2Na CrO Pb NO  PbCrO4 (s) Na NO3-
Write the net ionic equation.
CrO Pb PbCrO4 (s)

10. From Example 2: 2CH3CO2H + Sr+2 + 2OH-  Sr+2 + 2CH3CO2- + 2H2O
Write net ionic equation.
2CH3CO2H OH CH3CO H2O

11. Putting it ALL together ! ! !

12. Example 3:
Na2CO3 + Ca(NO3)2  2NaNO3 + CaCO3 (s) Write net ionic equation
CO Ca CaCO3 (s)

13. Example 4:
Magnesium metal reacts with HCL to produce a solution of magnesium chloride and hydrogen gas.
Write the molecular equation and net ionic equation.
Mg (s) HCl  MgCl H2 (g)
Have to do full ionic equation first.
Mg (s) H Mg H2 (g)

14. Homework
Net Ionic Equation worksheet.