Monday, Oct. 17th, 2011
Review - Formation of a Precipitate
** Solubility Table
Soluble Insoluble -
Oct 16­7:49 PM
Ex.) AgNO3(aq) + BaCl2(aq)
Ex.) CaS(aq) + K2CO3(aq)
Oct 16­7:53 PM
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Total Ionic Equations
A chemical equation that illustrates all soluble ionic
compounds in their ionic form
It shows the separation of soluble ionic compounds
into their respective ions
For Example: Write the Net Ionic Equation for the following reaction:
Na2SO4(aq) + CaCl2(aq) --> CaSO4(s) +
NaCl(aq)
This equation indicates which ions are in solution (aq),
and which ions are found in precipitate form (s).
Oct 16­7:56 PM
Net Ionic Equations
A chemical equation that shows only the ions that
are involved in a chemical reaction.
Once you have the Total Ionic Equation, circle the
spectator ions and eliminate them on both sides of
the equation.
Spectator ion - an ion that is present during a chemical reaction
but does not participate in the reaction.
(ie. An ion that remains (aq) during the reaction and appears on
both reactant and product sides of the equation).
• There should be the same number of each of these spectator
ions on both sides of the arrow
Oct 16­7:56 PM
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Example - Continued:
Na2SO4(aq) + CaCl2(aq) --> CaSO4(s) + 2NaCl(aq)
2Na1+(aq) + SO42-(aq) + Ca2+(aq) + 2Cl1-(aq)--> CaSO4(s) + 2Na1+(aq) + 2Cl1-(aq)(**Cirlce Spectator Ions)
Oct 16­8:17 PM
Example #2:
Write the Total Ionic and Net Ionic Equation for the
following reaction:
AgNO3(aq) + BaCl2(aq) --> Ba(NO3)2(aq) + AgCl(s)
Step 1.) Balance the equation
Step 2.) Separate the aqueous compounds into ions ***Remember to include the coefficients
Step 3.) Circle the Spectator Ions
Step 4.) Eliminate the Spectator Ions & Write the Net Ionic Equation
Oct 16­8:17 PM
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Example #3:
Write the Total Ionic and Net Ionic Equation for the
following reaction:
Ex.) CaS
(aq)
+ K CO
--> CaCO
+ K S
2 3(aq)
3(s)
2 (aq)
Step 1.) Balance the equation
Step 2.) Separate the aqueous compounds into ions ***Remember to include the coefficients
Step 3.) Circle the Spectator Ions
Step 4.) Eliminate the Spectator Ions & Write the Net Ionic Equation
Oct 16­8:17 PM
Oct 16­9:07 PM
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