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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:
$ZnSO_4$​​​​​​​
Write balanced equation for this reaction.
✓

Answer

$\underset{\text { Colourless }}{ ZnSO _4}+2 NaOH \longrightarrow \underset{\text { white gelatinous ppt. }}{ Zn ( OH )_2 \downarrow}+\underset{\text { Colourless }}{ Na _2 SO _4}$
In excess of alkali, White gelatinous ppt. of $Zn ( OH )_2$ becomes soluble :
$Zn ( OH )_2+2 NaOH (\text { excess }) \longrightarrow Na _2 ZnO _2+2 H _2 O$
Sodium Zincate (Colourless)

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