Table 1: Test observations and results with known anions
Procedure |
Anion |
Actions |
Observations |
Proposed Equation |
1. Ba(NO3)2 test for PO43- and SO42- ions |
PO43- |
Added 3 drops of Ba(NO3)2 and then added 3 drops of HNO3 |
White precipitate, dissolved |
Ba + PO43- --> Ba3(PO)2 (s) |
|
SO42- |
Added 2 drops of 6 M HNO3 then added 3 drops of HNO3 |
White precipitate |
Ba + SO4 --> BaSO4 (s) |
|
Cl- |
Added 2 drops of 6 M HNO3 |
No precipitate |
|
|
NO3- |
Added 2 drops of 6 M HNO3 |
No precipitate |
|
2. AgNO3 test for Cl- ions and PO43- ions |
PO43- |
Added 2 drops of AgNO3 |
No precipitate |
|
|
SO42- |
Added 2 drops of AgNO3 |
No precipitate |
|
|
Cl- |
Added 2 drops of AgNO3 then added 3 drops of NH3 |
White precipitate |
Cl + Ag2 --> AgCl2 |
|
NO3- |
Added 2 drops of AgNO3 |
No precipitate |
|
3. Brown ring test for NO3- |
|
Added 5 drops of FeSO4 and also H2SO4 |
No brown ring |
|
Table 2: Analysis of unknown solution
Step |
Action |
Observations |
Anion Present |
1 |
Added Ba(NO3)2 |
No change/no precipitate |
Cl-, NO3- |
2 |
Added AgNO3 |
Precipitate formed |
Cl- |
3 |
Added H2SO4 |
No brown ring |
Cl- |
4 |
Added HNO3 |
No precipitate |
Cl-, NO3- |