What happens when ammonia solution is added first dropwise and then in excess to the following solutions: (i) CuSO4 (ii) ZnSO4 (iii)FeCl3. Write balanced equations for these reactions.

Home » What happens when ammonia solution is added first dropwise and then in excess to the following solutions: (i) CuSO4 (ii) ZnSO4 (iii)FeCl3. Write balanced equations for these reactions.

Analytical Chemistry: Uses of Ammonium Hydroxide and Sodium Hydroxide | Chemistry | Class 10 | ICSE | Selina

What happens when ammonia solution is added first dropwise and then in excess to the following solutions: (i) CuSO4 (ii) ZnSO4 (iii)FeCl3. Write balanced equations for these reactions.

Solution:

(i) CuSO₄ + 2NH₄OH → Cu(OH)₂ ↓ + (NH₄)2SO₄

With an excess of NH4OH, ppt. dissolves

Cu(OH)₂ + (NH₄)₂SO₄ + 2NH₄OH → [Cu(NH₃)₄]SO₄ + 4H₂O

ii)

ZnSO₄ + 2NH₄OH → Zn(OH)₂ ↓ + (NH₄)₂SO₄

With an excess of NH₄OH, ppt. dissolves

Zn(OH)₂ + (NH₄)₂SO₄ + 2NH₄OH → [Zn(NH₃)₄]SO₄ + 4H₂O

i

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