Part 2 - Qualitative analysis of simple inorganic salt - Anion test 1 (GIF images)

 Qualitative analysis of simple inorganic salt - Anion test with dil. HCl

1. Salt with dil. HCl: 

To a small amount of the salt, dil. HCl is added.

1a. Effervescence

Observation    : Brisk effervescence

Inference         : Presence of carbonate

Explanation for the observation:

Carbonate salts react with dil. HCl and give carbon dioxide (CO₂) gas. The evolution is observed as effervescence.

                                            

 

Warm the above solution.

1b. Colorless gas with rotten egg smell

Observation    : Colorless gas with the smell of rotten egg turning lead acetate paper into black.

Inference         : Presence of sulphide

Explanation for the observation:

Sulphide salts react with dil. HCl on heating gives hydrogen sulphide (H₂S) gas, which smells as rotten egg. 

The evolved gas reacts with lead acetate paper and forms lead sulphide (PbS), which is black in color.

Observation    : No characteristic change.

Inference         : Absence of carbonate and sulphide