Ferric Salts

Ferric Salts are salts of iron corresponding to ferric oxide (Fe₂O₃). When anhydrous they are usually colourless, but are of a yellow or brown colour When combined with water. The most important salt is ferric chloride FeCl₃, which forms iron-black crystals, very deliquescent, dissolving to a brown liquid. Ferric salts may be readily distinguished by giving in solution a fine blue precipitate with potassium ferrocyanide and a blood-red coloration, even in dilute solutions, with ammonium sulphocyanate.