Knowra Iron(II) chloride Iron(II) chloride Iron(II) chloride is an inorganic compound with formula FeCl₂, consisting of iron in the +2 oxidation state and chloride ions. It occurs as an anhydrous solid and several hydrates.
Iron : Iron is a chemical element with symbol Fe and atomic number 26. Iron supplies the Fe²⁺ ions that distinguish this compound from iron(III) chloride.
Oxidation-reduction reaction : An oxidation-reduction reaction transfers electrons between chemical species, changing their oxidation states. Iron(II) chloride can act as a reducing agent when Fe²⁺ is oxidized to Fe³⁺.
Wastewater treatment : Wastewater treatment removes contaminants from used water through physical, chemical, and biological processes. Iron(II) chloride supplies iron ions that help remove contaminants during treatment.
Iron(III) chloride : Iron(III) chloride is an iron halide with formula FeCl₃, containing iron in the +3 oxidation state. Its higher iron oxidation state changes its color, reactivity, and stoichiometry.
Chloride : Chloride is the negatively charged ion Cl⁻, formed when a chlorine atom gains an electron. Two chloride ions balance each Fe²⁺ ion in FeCl₂.
Hydrolysis : Hydrolysis is a chemical reaction in which a substance reacts with water, often changing bonds or ionization states. Dissolved Fe²⁺ ions interact with water, affecting the acidity of iron(II) chloride solutions.
Phosphorus removal : Phosphorus removal is the separation of phosphorus compounds from water, often by precipitation with metal salts. Iron(II) salts can bind phosphate and form solids that can be separated from wastewater.
Iron(II) bromide : Iron(II) bromide is an iron halide with formula FeBr₂, containing bromide instead of chloride ions. It preserves Fe²⁺ while substituting a different halogen for chlorine.
Oxidation state : An oxidation state is the formal charge assigned to an atom in a substance under agreed electron-allocation rules. The +2 oxidation state identifies the iron represented in the compound’s name.
Iron(II) hydroxide : Iron(II) hydroxide is an inorganic compound with formula Fe(OH)₂, commonly formed as a precipitate from Fe²⁺ solutions. Adding hydroxide to an iron(II) chloride solution can precipitate this compound.
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