Nitrate (NO3-)

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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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