Net Ionic Equations
Review
Grade lab reports
Notes on Net ionic equations
Guided Practice
Homework
Write, predict, balance
1.
Sulfur dioxide reacts with water.
Grading of Lab Reports
Using the provided rubric grade the lab
report you are provided.
Discuss their thinking and conclusions.
Net Ionic Equations I
Date:
Electrolytes
Many times the reactants of DR rxns are in
aqueous solutions.
This means that the compound (ionic salt)
actually separates into its cation and anion in
water
They become electrolytes.
 Able to conduct electricity
 Observe: strong, weak and non-electrolytes
All important product, AIP
In order for a double replacement reaction
to occur, it must create:
 precipitate(solid)
 water
 gas
Example Problem
AgNO3
+
NaCl
g
AgCl
+
NaNO3
Using the solubility chart, determine the state of matter
of each compound.
 This is the MOLECULAR EQUATION
 Which is the all important product?
 Rewrite the equation, separating each aqueous
compound into its cation and anion.

Ag+(aq) + NO3-(aq) + Na+(aq) + Cl-(aq) g AgCl(s) + Na+(aq) + NO3-(aq)
This is the COMPLETE IONIC EQUATION
Omit matching ions from both sides of the equation; these are
the spectator ions, they only watched the chemistry take place
– they were not a part of it.
 Scratch NO3-(aq) and Na+(aq)
What remains is the NET IONIC EQUATION, the
actual chemistry that took place.
Ag+(aq) + Cl-(aq) AgCl(s)
BaCl2 + MgSO4 g MgCl2 + BaSO4
Ba+2(aq) + SO4-2(aq) g BaSO4(s)
Sr(C2H3O2)2+Na2SO4gSrSO4+ 2NaC2H3O2
Sr+2(aq) + SO4-2(aq) g SrSO4(s)
LiOH + HCl g LiCl + H2O
OH-(aq) + H+(aq) g H2O(l)
Na2CO3 + HI
CO3-2(aq) + 2H+(aq) g H2O(l) + CO2(g)