Arsenic (As+)

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 original solution.	Yellow coloured precipitate formed.	As(III) may be present.

Confirmatory Test:-

Experiment	Observation	Inference
Added dilute hydrochloric acid to above solution.	Yellow coloured precipitate formed.	As(III) confirmed.

Chemical Equations:-

Ionic equation:-

2As³⁺ + 3H₂S_(g) –> As₂S_3(s)(yellow) + 6H⁺

2As₂S_3(s)(yellow)  + 12HCl_(l) –> 4AsCl_3(s)(yellow) + 6H₂S

Chemical Equations:-

Ionic equation:-

NO₃^– + 3Fe²⁺ + 4H⁺ → 3Fe³⁺ + NO + 2H₂O

[Fe(H₂O)₆]²⁺ + NO → [Fe(H₂O)₅(NO)]²⁺

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