Zinc (Zn2+)

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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


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. 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. White coloured precipitate formed. Zn (II) may be present.

Confirmatory Test:-

Experiment Observation Inference
Dissolved the precipitate in concentrated hydrochloric acid and boiled it.Added potassium ferrocyanide to it. Bluish white coloured precipitate formed. Zn (II) Confirmed.

Chemical Equations:-

Ionic equation:-

Zn 2+ + H2S(aq) –> ZnS(s)(White) + 2H+

ZnS(aq) + 2HCl(aq) –> ZnCl2 + 2H+ + S2-

2Zn 2+ + K4[Fe(CN)6]  –> Zn2[Fe(CN)6](Bluish White) + 4K+

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