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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.
$FeCl_3$ Write balanced equation for this reaction.
✓

Answer

$\underset{\text { yellow }}{ FeCl _3}+3 NaOH \longrightarrow \underset{\text { reddish brown, ppt }}{ Fe ( OH )_3 \downarrow}+\underset{\text { colourless in solution }}{3 NaCl }$
In excess of alkali, the reddish brown ppt. of $Fe ( OH )_3$ remains insoluble.

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