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Questions
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.
Write the observation and balanced equation for the following reaction:
Ammonium hydroxide is added first in a small quantity, and then in excess, to a solution of copper sulphate.
State the relevant observation for the following:
Ammonium hydroxide is first added in a small quantity and then in excess to a solution of copper sulphate.
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Solution
On adding a small quantity of ammonium hydroxide to copper sulphate solution, a pale blue precipitate of copper(II) hydroxide is formed. On adding excess ammonium hydroxide, the precipitate dissolves to form a deep/inky blue solution.
\[\ce{CuSO4 + 2NH4OH -> \underset{Blue ppt.}{Cu(OH)2}↓ + (NH4)2SO4}\]
In excess
\[\ce{Cu(OH)2 + (NH4)2SO4 + 2NH4OH -> \underset{Deep Blue Solution}{[Cu(NH3)4]SO4} + 4H2O}\]
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