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What happen when : (i) aqueous ammonia is added dropwise to a solution of copper sulphate till it is in excess. (ii) CrCI 3 solution is treated with sodium hydroxide and then with hydrogen peroxide.

What happen when :
(i) aqueous ammonia is added dropwise to a solution of copper sulphate till it  is in excess.
(ii) CrCI3 solution is treated with sodium hydroxide and then with hydrogen peroxide.

Grade:11

1 Answers

Aditi Chauhan
askIITians Faculty 396 Points
9 years ago
(i) CuSO4 + 4NH4OH → [Cu(NH3)4]SO4 + 4H2O or CuSO4 + 2NH4OH → Cu(OH)2 + (NH4)2­SO4
Cu(OH)2 + 2(NH4)2SO4
→ [Cu(NH3)4]SO4 + 2H2O + H2SO4
Deep blue complex
(ii) H2O2 → H2O + [O] ] * 3
CrCI3 + 3NaOH → Cr(OH)3 ↓ + 3NaCI
Green
236-802_1212121.jpg
Yellow
ALTERNATIVE SOLUTION : Precipitates, having green colouration of Cr(OH)3 are formed. The green precipitate then dissolves to produce a yellow solution of chromate. Reaction are
CrCI3 + 3NaOH → Cr(OH)3 ↓ + 3NaCI
(geen)
H2O2 → H2O + [O]
2Cr(OH)3 + 4NaOH + 3[O] → 2Na2CrO4 + 5H2O

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