Using sodium hydroxide solution, how will you distinguish: Iron (… - Vidyadip

Question

Using sodium hydroxide solution, how will you distinguish:
Iron (II) chloride from iron (III) chloride

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Answer

Iron (II) chloride from iron (III) chloride
(i) $FeCl _2+2 NaOH \longrightarrow Fe ( OH )_2+2 NaCI$
$Fe ( OH )_2$ precipitates are dirty green gelatinous in nature.
(ii) $FeCl _3+3 NaOH \longrightarrow Fe ( OH )_3+3 NaCI$
$Fe ( OH )_3$ precipitates are reddish brown in colour.

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