ferric chloride

noun Chemistry.
a compound that in its anhydrous form, FeCl 3 , occurs as a black-brown, water-soluble solid; in its hydrated form, FeCl 3 ⋅xH 2 O, it occurs in orange-yellow, deliquescent crystals: used chiefly in engraving, for deodorizing sewage, as a mordant, and in medicine as an astringent and styptic.
Also called iron trichloride, iron perchloride.


Origin:
1890–95

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In an ice bath, mix equal volumes of sodium hydroxide solution, hydroxylamine hydrochloride solution and ferric chloride solution.
Ferric chloride was tested as a supplemental coagulant to enhance capture of colloidal phosphorus precipitates.
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