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. | No Effect. | Pb(II), Cu(II) , As(III) absent. |
| Added dilute hydrochloric acid, concentrated nitric acid, and boiled solution. Then cooled it and added solid ammonium hydroxide. | No Effect. | Al(III) ,Fe(III) absent. |
| Passed Hydrogen disulphide gas through the above-formed solution. | Flesh(buff) coloured precipitate formed. | Mn (II) may be present. |
Confirmatory Test:-
| Experiment | Observation | Inference |
| Added lead dioxide to above solution, then added concentrated nitric acid. Boiled it. | Pink Colouration formed. | Mn (II) Confirmed. |
Chemical Equations:-
Ionic equation:-
Mn 2+ + H2S(aq) –> MnS(s)(Flesh) + 2H+
MnS(aq) + 2HCl(aq) –> MnCl2 + 2H+ + S2-
2Mn 2+ + 4H+ + 5PbO2(s) –> 2MnO4–(aq) + 5Pb2+(aq) + 2H2O(aq)
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