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When dissolved in water, iron(III) chloride undergoes hydrolysis and gives off heat in an exothermic reaction. The resulting brown, acidic, and corrosive solution is used as a flocculant in sewage treatment and drinking water production, and as an etchant for copper-based metals in printed circuit boards.ron(III) chloride hexahydrate consists of trans -[Fe(H 2 O) 4 Cl 2 ] + cationic complexes and chloride anions, with the remaining two H 2 O molecules embedded within the monoclinic crystal structure. Iron(III) chloride has a relatively low melting point and boils at around 315 Â°C.
Best Answer: Actually, the iron(III) ion, [Fe(H2O)6]3+, is an extremely pale purplish colour, as you will see if you grow a crystal of iron ammonium alum, NH4Fe(SO4)2.12H2O.This is because the ion is high spin d5, meaning that d-d transitions are spin-forbidden, and therefore even weaker than usual.ron(II) ion = green. Iron(III) ion = yellow. Rust (Iron oxide + water)= black or brown. Explain why the rust of iron is not green or yellow, but black or brown. Add your answer. Source.