cation-anion lab - Kris Kelly Cation-Anion Lab CHEM 121L...

Kris Kelly
Cation-Anion Lab
CHEM 121L
11/26/07
Theory/Background:
In this lab, various processes and chemical reactions will take place in order to
determine whether or not cations or anions are present. This is more of a
qualitative analysis type experiment where calculations are absent and detailed
observations of the reaction process are written down. In order to determine
which types of cation or anion is present, two tests must be performed, a
preliminary test and a specific test. A preliminary test is a procedure used to
determine if cations or anions are present in the first place. If that test proves
positive, specific tests for different ions may be executed.
Key Data:
Reagent Observations Equations
1 Litmus paper turned blue
Solution turned brown
2 White precipitate
Yellow Solution
3a Reddish brown precipitate
3b Yellow liquid formed
3c Blue precipitate formed
4 Brick red flame formed
5a Strawberry red precipitate
formed

Preliminary Concentrated H SO Test
Ion Observations Equations
SO No reaction
NO No reaction
CO Violent bubbling
Choking odor
Cloudy white precipitate
Clear gas
Cl Test tube began smoking
(white gas)