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Questions
Give one chemical test to distinguish between the following pair of compounds:
Iron (II) chloride solution and iron (III) chloride solution
Give a chemical test to distinguish between:
Iron (II) chloride solution and iron (III) chloride solution.
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Solution
| Iron (II) chloride | Iron (III) chloride |
|
Add sodium hydroxide to the above solution; a dirty green ppt. is formed. \[\ce{FeCl2 + 2NaOH -> 2NaCl + Fe(OH)2\downarrow}\] |
Add sodium hydroxide to the above solution; a reddish-brown ppt. is observed. \[\ce{FeCl3 + 3NaCl -> 3NaCl + Fe(OH)3\downarrow}\] |
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Sodium hydroxide solution is added first in a small quantity, then in excess to the aqueous salt solutions of copper (II) sulphate, zinc nitrate, lead nitrate, calcium chloride and iron (III) sulphate. Copy the following table and write the colour of the precipitate in (i) to (v) and the nature of the precipiatate (soluble or insoluble) in (vi) to (x)
| Aqueous salt Solution | Colour of Participitate when NaOH is added in a samll quantity | Nature of precipitate(soluble or insoluble) when NaOH added in excess |
| Copper (II) Solution | ||
| Zinc nitrate | ||
| Lead nitrate | ||
| Calcium chloride | ||
| Iron(III) sulphate |
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