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 |
| Added dilute sulphuric acid to given salt. | No effect. | Carbonate, sulphide , sulphite, nitrate absent. |
| Added concentrated sulphuric acid to given salt. | Brown colour gas evolved. | Nitrate or Bromide may be present. |
| Added copper turnings. | Brown colour intensifies. | Nitrate may be present. |
Confirmatory Test:-
| Experiment | Observation | Inference |
| Added fresh ferrous sulphate, nitric acid to salt. Added concentrated sulphuric acid along the walls of test tube. | Brown coloured ring is formed. | Nitrate confirmed. |
Chemical Equations:-
Ionic equation:-
NO3– + 3Fe2+ + 4H+ → 3Fe3+ + NO + 2H2O
[Fe(H2O)6]2+ + NO → [Fe(H2O)5(NO)]2+
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The ring form due to…???
Ring is formed due to the formation of brown ring complex.. [Fe(H2O) 5NO]
Can you explain the nitrate test equation for KNO3. Also mention the name for complex which we got.