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Question
Write the observation for the following :
NH4OH is added first in a small quantity and then in excess to a solution of copper sulphate.
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Solution
Dropwise addition of NH4OH:
\[\ce{CuSO4 + 2NH4OH -> \underset{\text{Blue ppt.}}{Cu(OH)2} + (NH4)2SO4}\]
with excess of NH4OH, the precipitate of copper(II) hydroxide dissolves as:
\[\ce{Cu(OH)2 + (NH4)2SO4 + \underset{\text{In excess}}{2NH4OH} -> \underset{\text{Tetrammine copper(II) sulphate}}{[Cu(NH3)4]SO4 + 4H2O}}\]
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