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When copper (ii) sulphate solution is treated with excess ammonium hydroxide, a precipitate is first...

Chemistry
JAMB 1980

When copper (ii) sulphate solution is treated with excess ammonium hydroxide, a precipitate is first formed, and then this dissolves to give a deep blue solution.

This deep blue solution is a?

  • A. Cu(OH)2
  • B. CuSo4.5H2O
  • C. (NH4)2SO4
  • D. Cu(NH3)4(OH)2
  • E. CuSO4.(NH4)2SO4.2H2O
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Correct Answer: Option D
Explanation

\(CuSO_4+2NH_4OH→(NH_4)_2SO_4+Cu(OH)_2\)(pale−blue)

The pale blue precipitate of copper hydroxide dissolves in excess of ammonium hydroxide forming tetraamine copper [II] sulphate, an azure blue(deep blue) soluble complex salt.

\(Cu(OH)_2+(NH_4)_2SO_4+2NH_4OH→[Cu(NH_3)_4]SO_4+4H_2O\)


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