cloretosferricos

Cloretos ferricos, also known as ferric chlorides, designate chemical compounds in which iron is in the +3 oxidation state coordinated to chloride ligands. The most common member is iron(III) chloride, FeCl3, which exists as an anhydrous solid or as hydrates such as FeCl3·6H2O. In solution, ferric chloride forms highly acidic chloride-rich solutions.

Anhydrous FeCl3 is a dark reddish-brown crystalline solid that is highly hygroscopic and decomposes on heating, with a melting point around 306°C. On contact with water, FeCl3 hydrolyzes to Fe(OH)3 and HCl, producing acidic solutions and often a yellow‑brown color due to hydrolysis products. In chloride media, Fe3+ forms various chloro-complexes, such as [FeCl6]3−, which influence its reactivity.

Industrial production is based on direct chlorination of iron with chlorine gas: 2 Fe + 3 Cl2 → 2 FeCl3. Hydrated forms and solutions are widely marketed for laboratory and industrial use; FeCl3·6H2O is common as a solid reagent and FeCl3 solutions are used as etchants and catalysts.

Primary applications include coagulation and clarification in municipal water and wastewater treatment; etching of copper in printed circuit board fabrication; acting as a Lewis acid catalyst in organic synthesis; and as a pigment or mordant in dyeing processes.

Ferric chlorides are corrosive and irritant to skin, eyes, and respiratory tract. They hydrolyze in water to release hydrochloric acid; they should be handled with appropriate PPE, stored in tightly closed containers in a dry, ventilated area away from incompatible materials. Spills should be contained and neutralized, with attention to environmental hazards to aquatic life.