Net ionic equations are useful in that they show only those chemical species directly participating in a chemical reaction The keys to being able to write net ionic equations are the ability to recognize monatomic and polyatomic ions ID: 915662
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Slide1
Net Ionic Equations
Slide2Net-ionic Equations
Net ionic equations are useful in that they show only those chemical species directly
participating in
a chemical
reaction
The keys to being
able to
write net ionic equations are the ability to recognize monatomic and polyatomic ions,
the solubility
rules, and the rules for electrolyte behavior.
Slide3Net ionic equations
Complete ionic equations
An ionic equation that shows all of the particles in a solution as they realistically exist
2
Na
+
(
aq
) + 2OH- (
aq
) + Cu
+2
(
aq
) + 2
Cl
-
(
aq
)
2
Na
+
(
aq
) + 2
Cl
-
(
aq
) + Cu(OH)
2
(s)
Note
that the
sodium ions
and the
chloride ions
are both reactants and products, therefore they do not participate in the reaction
Ions that do not participate in the reaction are called
spectator ions
Slide4Net-ionic Equations
Ionic equations that include only the particles that participate in the reaction are called net
ionic equations
Net ionic equations are written form complete ionic equations by crossing out all spectator ions
Example:
2
Na
+ (aq) + 2OH- (aq) + Cu+2 (aq) + 2Cl- (aq) 2 Na + (aq) + 2 Cl- (aq) + Cu(OH)2 (s)
Slide5Net-ionic Equations
A net ionic equation is what remains after the sodium and chloride ions are crossed out of this complete ionic equation
2OH
-
(
aq
) + Cu
+2 (aq) Cu(OH)2Only the hydroxide and copper ions are left in the net ionic equation shown above
Slide6Example:
Write the chemical, complete ionic, and net ionic equations for the
rxn
between aqueous solutions of barium nitrate and sodium carbonate that forms the precipitate barium carbonate.
Complete Ionic Equation:
Ba(NO
3
)2 (aq) + Na2CO3 (aq) BaCO3 (s) + NaNO3 (aq)Balance the equation above:Ba(NO3)2(aq) + Na2CO3 (
aq) + BaCO3 (s) + 2 NaNO
3 (aq)
Slide7Example continued:
Show the ionic states of the reactants and products
Ba
+2
(
aq
) + 2NO
3- (aq) + 2Na+ + CO3-2 (aq) BaCO3 (s) + 2 Na+ (aq) + 2NO3- (aq)Cross out the spectator ions from the complete ionic equation:Ba+2 (aq) + 2NO3- (aq) + 2Na
+ + CO3-2 (aq)
BaCO3 (s) + 2
Na+ (
aq
) + 2NO
3
-
(
aq
)
Slide8Example continued:
The net ionic equation is:
Ba
+2
(
aq
) + CO
3-2 (aq) BaCO3 (s)
Slide9Practice
Work on problems 33-36 on pg. 294 of your chemistry book