Strontium (Sr2+)

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.	No Effect.	Zn (II) , Mn(II),  Ni(II),  Co(II) absent.
Added ammonium carbonate to above solution.	White precipitate is formed.	Ba(II), Sr(II), Ca(II) may be present.

Confirmatory Test:-

Experiment	Observation	Inference
Dissolved precipitate in acetic acid and boiled it. Added few drops of ammonium sulphate to above solution and then added ammonium hydroxide.	White precipitate is formed.	Sr(II) Confirmed.

Chemical Equations:-

Ionic equation:-

Sr²⁺ + (NH₄)₂CO₃ (aq) –> SrCO_3(s)(white) + 2NH₄⁺_(aq)

SrCO₃(s) + 2CH₃COOH (aq)  –> (CH₃COO)₂Sr + CO₂(g) + H₂O(l)

Sr²⁺_(aq) + (NH₄)₂SO_4(aq) –> SrSO_4(s)(white)  +  2NH₄⁺_(aq)

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