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Metal Oxide and Hydroxide

What would yo...

Question

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 a small quantity ammonium hydroxide is added to a solution of copper sulphate, a whitish-blue precipitate of copper hydroxide is formed. Upon addition of excess ammonium hydroxide, the precipitate dissolves and an inky-blue solution of tetramine copper sulphate is formed.

NH₄OH ⇌ NH₃ + H₂O
Cu²⁺ + 4NH₃ → [Cu(NH₃)₄]²⁺

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