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Question
Give one chemical test to distinguish between the following pair of compounds:
Iron (II) chloride solution and iron (III) chloride solution.
Solution
| Iron (II) chloride | Iron (III) chloride |
|
Add sodium hydroxide to the above solution; dirty green ppts are formed. \[\ce{FeCl2 + 2NaOH -> 2NaCl + Fe(OH)2\downarrow}\] |
Add sodium hydroxide to the above solution; reddish brown ppts are observed. \[\ce{FeCl3 + 3NaCl -> 3NaCl + Fe(OH)3\downarrow}\] |
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