| 1. | Safety |
| 2. |
Objectives/Overview |
| 3. |
Procedures |
|
4. |
Observations |
| 5. | |
| 6. | |
| 7. | |
| 8. | Conclusions |
| 9. | Grading Scale |
| 10. | Review Prelab Questions |
|
11. |
Review Postlab Questions |
Experiment
20
Qualitative
Analysis of Anions
SAETY
Avoid skin contact with all know and unknown solids and solutions.
Be particularly careful with solutions and precipitates containing barium or lead ions. These substances are toxic and can be absorbed through the skin. Wash your hands immediately upon contact with any of these solutions or precipitates.
DO NOT SMELL any of the gases generated from the chemical reactions!! Injury may result!!
Use care in handling all acids and bases.
Concentrated sulfuric acid (H2SO4), used in the brown ring test for NO3-, is particularly dangerous because it is not only a strong acid, but also a powerful dehydrating agent.
CAUTION: Severe burns can result from contact with the skin!
Nitric acid (HNO3) is not only a strong acid but also a strong oxidizing agent. The proteins in human skin will be oxidized through the xanthoproteic reaction upon exposure to concentrated HNO3 solution. This process is painful and produces a yellow discoloration of the skin that does not wash off!
Flush with water immediately if any acid or base is spilled on the skin.
Dispose of all chipped or cracked test tubes in the broken glass container.
