Name:_____________
Section:____________
Pre-Lab 7: Solubility and Net Ionic Equations
Answer the following questions after reading the background information at the beginning of
the lab. This should be completed before coming to lab.
1. Write the balanced equation for dissolving the following solid ionic salts in water:
a) NaCl(s)
b) Ba(NO3)2(s)
c) MgF2(s)
2. Write the total ionic and balanced net ionic equations for the following reactions:
a) AgNO3(aq) + NaCl(aq) ----> AgCl(s) + NaNO3(aq)
b) BaCl2(aq) + K2CrO4(aq) ----> KCl(aq) + BaCrO4(s)
c) KOH(aq) + Fe(NO3)3(aq) ----> Fe(OH)3(s) + KNO3(aq)
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Lab 7: Solubility and Net Ionic Equations
Objectives:
 In this experiment you will mix small quantities of aqueous ionic solutions together and in
some cases, observe the formation of precipitates.
General procedure:
1. Mix small quantities of different ionic solutions together.
2. Observe the absence or presence of a precipitate and its physical characteristics such as
color, amount, etc.
3. Formulate general solubility rules based on experimental observations.
4. Write net ionic equations to describe the precipitation reactions.
Safety
• Wear safety goggles at all times.
• Wear shoes that cover the entire foot.
• Never touch, taste or smell chemicals.
• Keep your hands away from your face, eyes, nose and mouth.
• Always wash your hands before leaving the laboratory.
.
Table of Ionic Salt Solutions
Solution
#1
Solution
#2
Solution
#3
Solution
#4
Solution
#5
Solution
#6
Set I
Set II
Ba(NO3)2
Na2SO4
BaCl2
Al2(SO4)3
NaI
Sr(NO3)2
AgNO3
CaCl2
NaNO3
AgNO3
KCl
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Part I. Writing Total Ionic and Net Ionic Equations
Students will test ionic salt solutions for insoluble products. This is done be systemaically
combining solutions
Equipment List:
 Set 1 of the ionic salt solutions
 12 well spotting plate
Procedure:
1.Clean the Twelve well spotting plate.
2.Spot a row of 5 spots on the spotting plate.
3.Test this row against the other 5 solution
in the first set.
4.Look for reactions and make observations
in the charts below.
Results
5.Choose another solution, and test against
the remaining 4 solutions.
6.Continue until all solutions have been
tested against each other.
Record observations in the chart below:
-Look for precipitates, gas bubbles, etc.
-Make notes on any colors seen in the precipitates/changes in solution color.
Set # I
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Discussion
For each of the solutions that showed a reaction, Record the solutions that were reacted and
generate a total and net ionic equation for each reaction.
Did A
Solutions
Reaction
Reacted
Occur?
Write out the Total Ionic
Equation and Net Ionic Equation
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Solutions Did A
Reacted Reaction
Occur?
Write out the Total Ionic
Equation and Net Ionic Equation
Additional Question #1. Which ion formed the most insoluble products?
Additional Question #2. What is the chemical formula for the colored precipitates, and what
are their names?
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Part II. Predicting Reactions
Students will test ionic salt solutions for insoluble products. This is done by systematically
combining solutions
Equipment List:
 Set 3 of the ionic salt solutions
 12 well spotting plate
Procedure:
1. Use the solubility laws to predict if
6. Test this row against the other 5
the these reactions should occur.
solution in the first set.
2. Record your predictions before
7. Look for reactions and make
beginning testing.
observations in the charts below.
3. Have the instructor initial the bottom
8. Choose another solution, and test
of the page.
against the remaining 4 solutions.
4. Clean the Twelve well spotting plate.
9. Continue until all solutions have
5. Spot a row of 5 spots on the spotting
been tested against each other.
plate.
Predictions
For each possible reaction indicate wither a reaction will occur or not, and what the reaction
product is.
Set #2
Solutions
Reacted
Will a
reaction
Occur?
Write the Net Ionic Equation for each.
1/2
1/3
1/4
1/5
2/3
2/4
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2/5
3/4
3/5
4/5
Results
Record observations in the chart below:
-Look for precipitates, gas bubbles, etc.
-Make notes on any colors seen in the precipitates/changes in solution color.
Actual Results
Set #2
Solutions
Reacted
Did a
Reaction
Occur?
Evidence?
1/2
1/3
1/4
1/5
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Was this
correctly
predicted?
2/3
2/4
2/5
3/4
3/5
4/5
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Name:_________________
Solubility and Net Ionic Equations
Report Sheet
Part I. Writing Total Ionic and Net Ionic Equations
Answer the following Questions
1. Which solids formed non-white
precipitates?
Partner:________________
Section:________________
2. How many reactions had solid products?
3. Write the net ionic equations for the silver
containing precipitates
Part II. Predicting Reactions
Answer the following Questions
1. # of incorrect predictions:
2. What Ion formed the most solid
precipitates?
3. What are the net ionic Equations of the
products?
Additional Questions:
1. Which of the following salts are soluble in water and explain why:
a) Na3PO4
b) CaCO3
2. Explain the following observations using solubility:
a) A warm can of soda fizzes up when opened
b) One pack of sugar will dissolve in 8 oz.of ice coffee at 35◦F, but 3 packets dissolve in a
hot cup at 180◦F.
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