1.

What do you observe when ammonium hydroxide is added to the aqueous solution of:(a) FeSO4 (b) Iron (III) chloride, (c) Lead nitrate (d) Zinc nitrate?

Answer»

(a) Dirty green ppt. of Ferrous hydroxide is formed which is insoluble in excess of NH4OH.

FeSO4+ 2NH4OH  [NH4]2SO4 + Fe(OH)2

(b) Reddish brown ppt. of ferric hydroxide is formed which is insoluble in ammonium hydroxide.

FeCl3 + 3NH3OH  3NH4Cl + Fe(OH)3

(c) White ppt. of lead hydroxide is formed which is insoluble in NH4OH.

Pb(NO3)2 + 2NH4OH → 2NH4NO3 + Pb(OH)2

(d) White gelatinous ppt. of Zinc hydroxide is formed which is soluble in NH4OH.

Zn(NO3)2 + 2NH4OH 2NH4NO3 + Zn(OH)2



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