What would you observe in the following case?
Ammonium hydroxide is first added in a small quantity and then in excess to a solution of copper sulphate.

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Solution

When ammonium hydroxide is added with copper sulphate in small amount, a blue precipitate appears known as copper hydroxide. The reaction is as follows :
${CuSO}_{4} (s) + 2 {NH}_{4} OH (l) \to Cu {(OH)}_{2} (s) ↓ + {({NH}_{4})}_{2} {SO}_{4} (s)$
(Copper (Ammonium (Copper (Ammonium
suphate) hydroxide) hydroxide) suphate)
Blue ppt.
Further when ammonium hydroxide is added in excess, the blue precipitate that formed previously dissolved to form a deep blue solution known as tetraamminecoppersulphate. The reaction is as follows :
Ammonium hydroxide in excess :
$Cu {(OH)}_{2} (s) + {({NH}_{4})}_{2} {SO}_{4} (s) + 2 {NH}_{4} OH (l) \to [Cu {({NH}_{3})}_{4}] {SO}_{4} + 4 H_{2} O (l)$
(Copper (Ammonium (Ammonium (Tetraammine (Water)
hydroxide) suphate) hydroxide) coppersuphate)
in excess Deep blue solution

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State what you will observe when ammonium hydroxide solution is added to copper sulphate in excess.

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