Experiment 15 Qualitative Anion Tests

Purpose:
The purpose of this experiment is to identify some commonly occurring anions & to study some of the reactions used for their identification.

Materials:
1 Household Bleach, 2 mL
1 Distilled water
1 Toothpicks
2 Beaker, 50 mL, plastic
1 Cylinder-25-mL
1 Pencil, marking
1 Test Tube (5), 13 x 100 mm in Bubble Bag
1 Well-Plate-24
1 Ammonium Molybdate, 0.2 M - 2 mL in Pipet
1 Aqueous Ammonia, 6 M, NH4OH - 4 mL in Pipet
1 Barium Chloride, 0.3 M - 2 mL in Pipet
1 Hydrochloric Acid, 6 M - 8 mL in Dropper Bottle
1 Nitric Acid, 6 M - 2.5 mL in Pipet
1 Organic Reagent - 1.5 mL in Vial
2 Pipet, Empty Short Stem
1 Silver Nitrate, 0.1 N - 6 mL in White Dropper Bottle
1 Sodium Bromide, 0.1 M - 2.5 mL in Pipet
1 Sodium Carbonate, 0.25 M - 2.5 mL in Pipet
1 Sodium Chloride, 0.1 M - 2.5 mL in Pipet
1 Sodium Iodide, 0.1 M - 2.5 mL in Pipet
1 Sodium Phosphate, 0.1 M - 2.5 mL in Pipet
1 Sodium Sulfate, 0.1 M - 2.5 mL in Pipet
1 Sodium Sulfide, 0.1 M - 2.5 mL in Pipet
1 Unknown - 5 mL in Pipet
1 Lead Acetate Strips - 2 in Bag 2"x 3" – Assembly

Procedure

1. Before beginning, set up a data table similar to the Data Table: Qualitative Anion Tests in the
Lab Report Assistant section.
2. Each anion tested will require the use of three separate test tubes. Complete all of the following tests on one solution, record your observations, and then thoroughly clean and dry the test tubes before beginning tests on the next solution.
3. After consecutively testing the identified anions, perform the same tests on the unknown solution to conclusively determine its identity.
4. First test tube:
a. Put 8 drops of the anion to be tested in a clean small test tube.
b. Add 8 drops of hydrochloric acid to the anion solution. Note the appearance of the solution plus any evolution of gas and odors of gas.
5. Second test tube:
a. Put 8 drops of the anion solution in a second test tube.
b. Add 3 drops of silver nitrate solution.
c. Note the colors of any precipitates