CHEMISTRY 12 – Solubility Qualitative Analysis Activity
You will be given an unknown solid in groups of 2 (you may work alone if you wish). Your task is to
determine which solid you have been given using the ‘Solubility of Common Compounds’ table in your
data book, and what you have learned about solubility and solubility charts.
Possible Unknowns
Sr(NO3)2
KI
Na2CO3
FeCl3
CuSO4
ZnCl2
ZnSO4
BaCl2
Available Aqueous Solutions
NaCl
AgNO3
Pb(NO3)2
NaOH
ZnCl2
K2CO3
Na2SO4
KI
KNO3
Procedure
1. Put on goggles.
2. Take your unknown and dissolve in 50 ml water in a 100 ml beaker. Label the unknown solution
with the number given on the original container.
The rest is up to you. Develop a written, step by step procedure to test the unknown to
determine the contents.
Disposal
All chemicals can be disposed of down the sink with plenty of water.
You will be required to hand in electronically details of the procedure you developed (sample
format on the last page), the observations of each step performed, and the identity of the
unknown (and the reasoning that led you to the identity)
CHEM 12 Qualitative Analysis Marking (/4)
0 Repeat (no mark given)
1 Not meeting expectation
2 Minimally meeting expectations
3 Meeting expectations
4 Exceeding expectations
-serious safety issue, repeat required
-procedure not provided
-unknown identified incorrectly
-errors in performing solubility tests
-sol. tests incorrectly interpreted
-reasoning not provided
-no observations provided
-incomplete procedure
-unknown identified correctly
-errors in interpreting sol. tests OR
reasoning not provided
-minimal observations provided
-complete procedure
-unknown identified correctly
-sol. Tests performed correctly and
reasoning provided
-clear observations provided
-complete procedure
-unknown identified correctly
-sol. Tests performed correctly and
reasoning provided
-unknown identified in 3 tests or less
-clearly stated observations
Sample:
Date
Group Members
Chemistry 12 Q.A. Activity
Purpose: (What are you trying to do?)
Unknown number: (provide here)
Procedure: (develop a step by step procedure of what solution you will add first, then the next etc)
Observations: (provide results of solubility chart)
Identity of Unknown: (Unknown #___ was determined to be __________)
Reasoning: (State specifically how you know the identity of the unknown, using the results from each
test to explain)
Error: (State any mistakes you specifically know that happened – mixing up chemicals, spills etc that
could affect the results)