DRAFT: This module has unpublished changes.

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-

DRAFT: This module has unpublished changes.