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Question

What do you observe when ammonia hydroxide is added to the aqueous solution of :

(a) FeSO4, (b) Iron (III) chloride,

(c) Lead nitrate, (d) Zinc nitrate ?

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Solution

(a) Dirty green ppt. of Ferrous hydroxide is formed which is insoluble in excess of NH4OH.
FeSO4 (aq) + 2NH4OH(aq) → [NH4]2SO4(aq) + Fe(OH)2(s)

(b) Reddish brown ppt. of ferric hydroxide is formed which is insoluble in ammonium hydroxide.
FeCl3(aq) + 3NH4OH(aq) → 3NH4Cl(aq) + Fe(OH)3(s)

(c) White ppt. of lead hydroxide is formed which is insoluble in NH4OH.
Pb(NO3)2(aq) + 2NH4OH(aq) → 2NH4NO3(aq) + Pb(OH)2(s)

(d) White gelatinous ppt. of Zinc hydroxide is formed which is soluble in NH4OH.
Zn(NO3)2(aq) + 2NH4OH(aq) → 2NH4NO3(aq) + Zn(OH)2(s)


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