Anion Essay

Qualitative Anion Tests
Purpose: To be able to identify some commonly occurring anions and to be able to study their reactions used to identify them.
Procedure:
1) Be sure to have a clean safe working environment.
2) In the first test tube: Put 8 drops of the anion solution to be tested and add 8 drops of hydrochloric acid to the anion solution, noting the appearance of the solution plus the evolution of any gas of odors of gas.
3) In the second test tube :
a) Put 8 drops of the anion solution to be tested.
b) Add 3 drops of silver nitrate solution
c) Note any color changes occurring
d) Write a net ionic equation for any reactions that produces a precipitate
e) Add a few drops of nitric acid to the test tube to acidify the solution.
f) Mix well and note what happens to the precipitate.
4) In the third test tube:
a) First add 1ml of bleach to a graduated cylinder adding 5mL of tap water and 6 drops HCL; Label an empty pipet and collect the solution into it.
b) Br and I add 10 drops of the test solution to add 2 to 3 drops of the organic reagent and several drops of the chlorine water. Shaking the solution well, allow the lower layer to settle Note the color of the layer.
c) Carbonate – Acidify 20 drops of the solution with 2 drops HCl. Try to detect an odor.
d) Chloride- to 6 drops of the solution add 2 drops AgNo3 –silver nitrate solution. A white precipitate should be seen.
e) Phosphate- Acidify 10 drops of the test solution with 1 drop HNO3 nitric acid and add 7 drops of ammonium molybdate solution ( shake the solution well before using) Wait 30 seconds. The phosphate should form a yellow precipitate.
f) Sulfate- to 10 drops of the test solution add 5 drops of the BaCl2 barium chloride solution. A white precipitate should form.
g) Sulfide- Acidify 10 drops of the test solution with HCl, the smell of rotten eggs should be present which