1. Net Ionic Equations Continued!

2. NaCl is soluble in water
NaCl is soluble in water. Solid NaCl dissociates into Na+ and Cl- ions in aqueous solution:
NaCl(s)  Na+(aq) + Cl-(aq)

3. See solubility rules on p 344 of the text
Pb(NO3) NaI  PbI2 + 2NaNO3
(aq) (aq) (s) (aq)
See solubility rules
on p 344 of the text

4. Net Ionic Equations Balanced Chemical Equation:
Pb(NO3)2(aq) + 2NaI(aq)  PbI2(s) + 2NaNO3(aq)
“Complete Ionic” Equation:
Pb2+(aq) + 2NO3-(aq) + 2Na+(aq)+ 2I-(aq)  PbI2(s) + 2Na+(aq) + 2NO3- (aq)
Cancel the “spectator ions” that appear on both sides of the arrow
“Net Ionic” Equation:
Pb2+(aq) + 2I-(aq)  PbI2(s)

5. Solubility Rules

6. For the exam: know how to use solubility rules to predict whether an ionic compound is insoluble or not

7. Net Ionic Equations Revisited:
Write the (balanced!) molecular equation first
Reaction products: swap cations and anions
Predict solubility (using Solubility rules)
Write the complete ionic equation next
(s) compounds don’t ionize
(aq) compounds do ionize
ion subscripts in the molecular equation become coefficients in the complete ionic equation!
Write the net ionic equation next
cancel spectator ions
The net ionic equation is a “simplified” form
of the complete ionic equation

8. Balanced Molecular Equation:
Example
Balanced Molecular Equation:
Ba(NO3)2 + NiSO4

9. Balanced Molecular Equation:
Example
Balanced Molecular Equation:
Ba(NO3)2 + NiSO4
Ni(NO3)2 + BaSO4

10. Balanced Molecular Equation:
Example
Balanced Molecular Equation:
Ba(NO3)2(aq)+ NiSO4(aq)
Ni(NO3)2 (aq)+ BaSO4(s)

11. Balanced Molecular Equation:
Example
Balanced Molecular Equation:
Ba(NO3)2(aq)+ NiSO4(aq)
Ni(NO3)2 (aq)+ BaSO4(s)
Complete Ionic Equation:
Ba2+(aq) + 2NO3-(aq) + Ni2+(aq) + SO42-(aq)
Ni2+(aq) + 2NO3-(aq) + BaSO4 (s)

12. Balanced Molecular Equation:
Example
Balanced Molecular Equation:
Ba(NO3)2(aq)+ NiSO4(aq)
Ni(NO3)2 (aq)+ BaSO4(s)
Complete Ionic Equation:
Ba2+(aq) + 2NO3-(aq) + Ni2+(aq) + SO42-(aq)
Ni2+(aq) + 2NO3-(aq) + BaSO4 (s)

13. Balanced Molecular Equation:
Example
Balanced Molecular Equation:
Ba(NO3)2(aq)+ NiSO4(aq)
Ni(NO3)2 (aq)+ BaSO4(s)
Complete Ionic Equation:
Ba2+(aq) + 2NO3-(aq) + Ni2+(aq) + SO42-(aq)
Ni2+(aq) + 2NO3-(aq) + BaSO4 (s)
Net Ionic Equation:
Ba2+(aq) + SO42-(aq)
BaSO4 (s)

14. What is the Net Ionic Equation for the reaction: HCl(aq) + NaOH(aq) ?

15. HCl(aq) + NaOH(aq) H2O(l) + NaCl(aq)
H+(aq) + -OH(aq) H2O(l)