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Qualitative Analyses
Various qualitative tests for ions including a few flame tests.
16
Chemistry
11th Grade
12/14/2009

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Term
NH4+
Definition
Add NaOH(aq).
Heat over a candle flame.
Hold moist red litmus paper over solution (should turn blue)
Waft to smell gas (Smells like ammonium)
Term
Al3+
Definition
Add NH3(aq).
A white precipitate should form and NOT dissolve
Term
Zn2+
Definition
Add NH3(aq).
A white precipitate should form and dissolve
Term
Na+
Definition
Use a flame test.
Should produce a "Golden Yellow" flame.
Term
Cu2+
Definition
Use a flame test.
Should produce a "Blue-Green" flame.
Term
Li+
Definition
Use a flame test.
Should produce a "Crimson" flame.
Term
Ba2+
Definition
Use a flame test.
Should produce a "Yellow-Green" flame.
Term
Sr2+
Definition
Use a flame test.
Should produce a "Orange-Red" flame.
Term
Ca2+
Definition
Use a flame test.
Should produce a "Orange" flame.
Term
K+
Definition
Use a flame test.
Should produce a "Violet" flame.
Term
Cl-
Definition
Add AgNO3(aq) (A white precipitate should form)
Add NH3 (Precipitate should dissolve)
Term
Br-
Definition
Add AgNO3(aq) (A cream coloured precipitate should form)
Get a new sample of the unknown liquid and add chlorine water and cyclohexane (The solution should turn Brown)
Term
I-
Definition
Add AgNO3(aq) (A yellow precipitate should form)
Get a new sample of the unknown liquid and add chlorine water and cyclohexane (The solution should turn Pink)
Term
(SO4)2-
Definition
Add HCl(aq) and BaCl2(aq). (A white precipitate should form)
Term
(CO3)2-
Definition
Add HCL (Bubbles should form)
Hold a dropper containing limewater above the solution (The limewater should turn cloudy)
Term
(NO3)-
Definition
Add FeSO4 and mix.
Add H2SO4. (A brown ring should form between the two layers)
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