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Analytical Chemistry Uses of Ammonium Hydroxide and Sodium Hydroxide — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryAnalytical Chemistry Uses of Ammonium Hydroxide and Sodium Hydroxide2 Marks
Question
What do you observe when caustic soda solution is added to the following solution: first a little and then in excess.
$CuSO_4$​​​​​​​ Write balanced equation for this reaction.
✓

Answer

$\underset{\text { Blue }}{ CuSO _4}+\underset{\text { colourless }}{2 NaOH } \longrightarrow \underset{\text { Pale blue ppt. }}{ Cu ( OH )_2 \downarrow}+\underset{\text { colourless }}{2 NaSO _4}$
In excess of alkali, pale blue precipitate of $Cu ( OH )_2$ is insoluble.

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