Using Sodium hydroxide solution, how would you distinguish: Iron(… - Vidyadip

Question

Using Sodium hydroxide solution, how would you distinguish: Iron(II) chloride from Iron (III) chloride

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Answer

Iron (III) chloride on reacting with sodium hydroxide forms brown ppt.
$
FeCl _3( aq )+3 NaOH ( aq ) \longrightarrow \underset{\text { brown }}{ Fe ( OH )_3( s )}+3 NaCl ( aq )
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Iron (II) chloride on reacting with sodium hydroxide forms green ppt.
$
FeCl _2( aq )+2 NaOH ( aq ) \longrightarrow \underset{\text { green }}{ Fe ( OH )_2( s )}+2 NaCl ( aq )
$

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