Chemistry
Distinguish between the following pairs of compounds using the test given in bracket :
(i) Iron [II] sulphate and iron [III] sulphate [using ammonium hydroxide]
(ii) A lead salt and a zinc salt [using excess ammonium hydroxide]
Ammonia
28 Likes
Answer
(i) On reaction with ammonium hydroxide, Iron [II] sulphate forms a dirty green ppt whereas iron [III] sulphate forms a reddish brown ppt. Hence, the two can be distinguished easily.
FeSO4 + 2NH4OH ⟶ (NH4)2SO4 + Fe(OH)2 ↓
Fe2(SO4)3 + 6NH4OH ⟶ 3(NH4)2SO4 + 2Fe(OH)3 ↓
(ii) A lead salt gives a chalky white ppt. on reaction with ammonium hydroxide that is insoluble in excess of ammonium hydroxide. For example:
Pb(NO3)2 + 2NH4OH ⟶ 2NH4NO3 + Pb(OH)2 ↓
On the other hand, zinc salt forms a white gelatinous ppt. which dissolves when excess of ammonium hydroxide is added. Hence, the two can be distinguished.
ZnSO4 + 2NH4OH ⟶ (NH4)2SO4 + Zn(OH)2 ↓
[Zn(OH)2] + (NH4)2SO4 + 2NH4OH ⟶ [Zn(NH3)4]SO4 + 4H2O
Answered By
19 Likes
Related Questions
Name the other ion formed when ammonia dissolves in water. Give one test that can be used to detect the presence of the ion produced.
Fill in the blank from the choices given in bracket : Ammonia gas is collected by ………….. (upward displacement of air, downward displacement of water, downward displacement of air)
State your observation : Calcium hydroxide is heated with ammonium chloride crystals.
Write balanced equation for : Action of warm water on magnesium nitride.