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Practical Work — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryPractical Work2 Marks
Question
Write the observation for the following :
$NH_4OH$ is added first in a small quantity and then in excess to a solution of copper sulphate.
✓

Answer

Dropwise addition of $NH _4 OH$ :
$CuSO _4+2 NH _4 OH \longrightarrow \underset{\text { Blue ppt. }}{ Cu ( OH )_2}+\left( NH _4\right)_2 SO _4$
with excess of $NH _4 OH$, the precipitate of copper(II) hydroxide dissolves as:
$Cu ( OH )_2+\left( NH _4\right)_2 SO _4+\underset{\text { In excess }}{2 NH _4 OH } \longrightarrow \underset{\text { Tetrammine copper(II) sulphate }}{\left[ Cu \left( NH _3\right)_4\right] SO _4+4 H _2 O }$

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