AIM: – To identify the given inorganic compound for its acidic and basic radical.
APPARATUS:- Chemical Reagent, Test Tube, Test Tube holder, Spatula
PROCEDURE:-
Preliminary Test:-
| Experiment | Observation | Inference |
| Smelled the salt. | No Ammonical smell. | Ammonium absent. |
| Added dilute hydrochloric acid to the original solution. | No Effect. | Lead(II) may be present. |
| Added hydrogen disulphide, hydrochloric acid to the original solution. | Black coloured precipitate formed. | Cu(II) ,Pb(II),As(III) may be present. |
| Added sodium hydroxide to the original solution. | Blue coloured precipitate formed. | Cu(II) may be present. |
Confirmatory Test:-
| Experiment | Observation | Inference |
| Added ammonium hydroxide to the original solution. | Blue coloured precipitate formed. | Cu(II) confirmed. |
Chemical Equations:-
Ionic equation:-
Cu2+(aq) + 2OH–(aq) –> Cu(OH)2(s)(blue)
Cu(OH)2(s) + 4NH3(aq) –> [Cu(NH3)4]2+(aq)(blue) + 2OH–(aq)
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