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Experiment 17
The Double Five Solution Problem
The goal if this lab is to observe and predict different types of double replacement
reactions. Students need to be able to predict the outcome of double replacement
reactions if the reactants are given. In this Lab students will also observe all kinds
of different reaction which will allow the students to experience the difference
between observing a reaction in the laboratory and predicting the products
theoretically.
Double replacement reactions: AB + CD  AD + CB
There are three different sets of bottles, a numbered set, and two different lettered
sets. Each set consists of five different aqueous solutions.
The labels have fallen off the bottles but the numbers and letters remain.
The solutions for each set is listed below:
Set 12345: MgCl2, Pb(NO3)2, BaCl2, Cu(NO3)2,, CuSO4
Set ABCDE: KCl, Sr(NO3)2, NaOH, Na2CO3, HCl
Set VWXYZ: Na2CO3, Ba(NO3)2, CaCl2, H2SO4, HCl
Prelab
As a prelab you need to predict theoretically all the possible reactions which could
occur between the five solutions. As a template a table is given for each solution
set. Inside the boxes write down what you expect to observe if you mix the two
reactants. Below the table write an overall balanced equation for each predicted
reaction. Obviously if you do not expect a reaction you do not need to write a
chemical reaction.
You will need to do this for two different sets of chemicals.
Procedure:
Work with one set of bottles at a time. Mix a few drops of one solution with a few
drops of another solution in a test tube and/or in the provided plates. To mix: Tap
the side of the test tube near the bottom with one hand while holding the top of the
test tube in the other hand. Note any evidence of chemical reaction in a table
similar to the one containing your predicted observations. Litmus paper may also be
used. Especially watch for precipitates (and colors), gas bubbles, and heat when
you mix the pairs. Rinse the test tubes with distilled water before putting in another
pair of solutions. (Tap water contains chloride ion, among others.) Dispose of all the
solutions and reaction mixtures in the waste container.
Compare your observations to your predictions from the prelab. Look for
similarities and differences how solutions react. Based on the observed and
predicted reactions you should be able to predict which compound is in which
bottle.
Prelab: Example for Set 1
Set 1:
Predict what you would observe in each of the following 10 possible reaction. See
examples in table:
Set 12345
MgCl2
Pb(NO3)2
Cu(NO3)2
BaSO4
white ppt
CuSO4
Cu(NO3)2
BaCl2
NR
BaCl2
Pb(NO3)2
Balanced chemical equations for predicted reactions:
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Prelab (2)
Set 2:
Predict what you would observe in each of the following 10 possible reaction:
Set ABCDE
KCl
Sr(NO3)2
NaOH
Na2CO3
HCl
Na2CO3
NaOH
Sr(NO3)2
Balanced chemical equations for predicted reactions:
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Prelab (3)
Set 3:
Predict what you would observe in each of the following 10 possible reaction.
Set ABCDE
Na2CO3
Ba(NO3)2
CaCl2
H2SO4
HCl
H2SO4
CaCl2
Ba(NO3)2
Balanced chemical equations for predicted reactions:
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NAME _______________
Report Sheet: Set 1
Observations:
Set 12345
1
2
3
4
5
4
3
2
Balanced Chemical Reactions for observed reactions:
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Solution 1: ______________
Solution 2:______________
Solution 3:______________
Solution 4:______________
Solution 5:______________
Report Sheet: Set 2
Observations:
Set
Balanced Chemical Reactions for observed reactions:
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Solution __ : ______________
Solution __ :______________
Solution __:______________
Solution __:______________
Solution __:______________