1. Ion Identification Lab
Using Qualitative Analysis to Determine the Ion Composition of a Solution

2. What is Qualitative Analysis?
Qualitative Analysis is a method used to determine the composition of a sample through the use of chemical tests.
For this lab, we will use the method to determine monatomic and polyatomic ions in a solution
Our goal is to use those ions to write the names and formulas of the compounds your teacher used to make your UNKNOWN.

3. Real-World Applications
What examples of chemical testing are used in common, everyday life? Brainstorm some:

4. Real-World Applications
What examples of chemical testing are used in common, everyday life? Brainstorm some:
Pregnancy test
Strep test
Drug test (OTC)
Hard water
HIV test (rapid version)
Lead paint test (hardware store)

5. What to expect Day 1—Cations & Anions Tests Day 2—Testing your unknown
Follow the procedures to see what a POSITIVE test result looks like when a certain ion is present
There are 3 anions to test. There are 3 cations to test.
One side of the lab is doing cation tests. The other side is doing anions tests.
Results & station must be CHECKED & STAMPED by me before you can move on.
Take a picture!
You will be given a small sample of an Unknown solution.
You will need to run all 6 tests on your unknown.
Results & station must be CHECKED & STAMPED by me before you can move on.
You should have 3 Y’s…that means your solution tested positive for 3 of the ions
Your Y’s must be a combination of anions & cations…WHY???

6. OBSERVATIONS OF SOLUTIONS THAT CONTAIN THESE IONS
ANIONSNegative Ions
ION
OBSERVATIONS OF SOLUTIONS THAT CONTAIN THESE IONS
↓ UNKNOWN SOLUTION ↓
OBSERVATIONS OF MY UNKNOWN SOLUTION
IS THIS ION IN YOUR UNKNOWN? (CIRCLE Y or N)
Cl-1
1. *color _______ _________ * 1.
*color _______ _________ *
Y N
SO4-2 2.
HCO3-1
3. *color _______ _________ *
3. *color _______ _________ *
CATIONS  Postive Ions
Ca+2 4.
4. *color _______ _________ *
NH4+1 5.
*color _______ _________ *litmus paper __________ *smell _________________
5. *color _______ _________ *litmus paper __________ *smell _________________
Li+1 6.
Color of Flame _____________

7. Safety 6M HNO3 6M HCl AgNO3 Na2C2O4 6M NaOH
ANIONS TESTS
CATIONS TESTS
6M HNO3
6M HCl
AgNO3
WASTE goes in specific WASTE BEAKERS!
Na2C2O4
6M NaOH
Burner---keep test tube moving…do not boil contents!
WAFT !
WASTE goes in specific WASTE BEAKERS!