Nitrite (NO2-)

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.	Reddish brown gas with pungent smell evolved.	Nitrite may be present.

Confirmatory Test:-

Experiment	Observation	Inference
Added potassium permanganate solution.	Pink colour of potassium permanganate discharged.	Nitrite confirmed.

Chemical Equations:-

Ionic equation:-

NO₂^– + H₂SO_{4(aq)  –>}  NO_(g) + SO₄^2- + H₂O_(l)

2KMnO_4(Pink) + 3H₂SO₄  + 5KNO₂ –> K₂SO_{4(Colourless)} +  2MnSO₄ +5KNO₃ + 3H₂O 

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