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Question
Using sodium hydroxide solution, how will you distinguish:
Iron (II) chloride from iron (III) chloride
Solution
Iron (II) chloride from iron (III) chloride
(i) \[\ce{FeCl2 + 2NaOH -> Fe(OH)2 + 2NaCI}\]
Fe(OH)2 precipitates are dirty green gelatinous in nature.
(ii) \[\ce{FeCl3 + 3NaOH -> Fe(OH)3 + 3NaCI}\]
Fe(OH)3 precipitates are reddish brown in colour.
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