Name: _____________________________________ Period: _______ Date: ____________________________
Analysis of Mystery Solutions Experiment
A Double Replacement Investigation
Purpose: To identify the contents of six unknown solutions and look for solubility patterns
Materials:
24-well spot plate, 0.1 M solutions of the following: silver nitrate, potassium iodide, sodium
chloride, lead (II) nitrate, 0.5 M sodium carbonate, and 1.0 M hydrochloric acid.
Procedure:
1. Add 2 drops of silver nitrate solution to the well marked #1 on the spot plate.
2. To the same well, add 2 drops of hydrochloric acid solution. Record any observations to the
Data Table.
3. In a similar manner, mix each of the other solutions listed in the Data Table. After each test,
record in the appropriate box what was formed and what you saw. Carefully describe any
products that were formed. If nothing happened, write “No Reactions”.
Data Table:
Silver
Nitrate
AgNO3
Hydrochloric
Acid
HCl
Sodium
Chloride
NaCl
Silver Nitrate
AgNO3
Hydrochloric
Acid
HCl
Sodium
Chloride
NaCl
Potassium
Iodide
KI
Lead (II)
Nitrate
Pb(NO3)2
Sodium
Carbonate
Na2CO3
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Potassium
Iodide
KI
Lead (II)
Nitrate
Pb(NO3)2
Sodium
Carbonate
Na2CO3
Name: _____________________________________ Period: _______ Date: ____________________________
Testing the Mystery Solutions
1. Gather a set of six bottles containing the six mystery solutions
2. Record the number of your set of bottles. Number of Unknown Set _______________
3. Rinse and dry your spot plate. Begin testing as before by choosing two unknown solutions
and mixing together two drops of each. Continue in this manner until all the solutions have
been mixed.
4. Keep a careful record of each reaction resulting from the mystery solution pairs.
A
B
C
D
E
F
A
B
C
D
E
F
Analysis & Conclusions
1. State the identity of each unknown solution
2. Write word equations and balanced chemical equations for each reaction that occurred. Be
sure to include the phase of the reactants and products.
3. What general conclusions may be drawn about the solubilities of compounds containing
silver, sodium, potassium, and lead? Write a paragraph discussing any observed trends.
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