Question

what will happen when Ammonia solution is added first dropwise and then in access in the CU S o4 solution

Answer 1

On adding little ammonia solution on copper sulphate solution, we get a pale blue precipitate of copper hydroxide.
CuSO4 + NH4OH -------> Cu(OH)2 + (NH4)2SO4

Now when we add excess ammonia solution, the precipitate dissolves, forming a deep azure blue solution.
Cu(OH)2 + NH4OH + (NH4)2SO4 ------> Cu[(NH3)4]SO4 + H2O

The above complex salt is called copper tetrammene sulphate, which is a deep blue solution.
thanks......

Answer 2

When excess of NH4OH is added to CUSO4 solution , the precipitate dissolves.

Explanation:

CUSO4 + 2NH4OH ------> CU(OH)2 (ppt.) + (NH4)2SO4

(Blue) ( Pale blue ppt.) ( colourless).

CU(OH)2 + (NH4)2SO4 + 2NH4OH ------> [CU(NH3)4]SO4 + 4H2O. ( Trtrammine

copper II

sulphate)

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