Chemistry
(a) What do you observe when ammonium hydroxide is added to the aqueous solution of :
(i) FeSO4
(ii) Iron (III) chloride.
(iii) Lead nitrate
(iv) Zinc nitrate
(b) Write balanced equation for Q.4(a).
Ammonia
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Answer
(i) Dirty green ppt. of ferrous hydroxide is formed which is insoluble in excess of NH4OH.
(ii) Reddish brown ppt. of ferric hydroxide is formed which is insoluble in excess of NH4OH.
(iii) White ppt. of lead hydroxide is formed which is insoluble in excess of NH4OH.
(iv) White gelatinous ppt. of Zinc hydroxide is formed which is soluble in excess of NH4OH.
(b) The balanced chemical equations are given as :
(i) FeSO4 + 2NH4OH ⟶ (NH4)2SO4 + Fe(OH)2 ↓
(ii) FeCl3 + 3NH4OH ⟶ 3NH4Cl + Fe(OH)3 ↓
(iii) Pb(NO3)2 + 2NH4OH ⟶ 2NH4NO3 + Pb(OH)2 ↓
(iv) Zn(NO3)2 + 2NH4OH ⟶ 2NH4NO3 + Zn(OH)2 ↓
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