Fe2 Chemical Name

Detection of iron

Occurrence in the separation pathway

In the separation reaction, iron is found in the urotropin group, where it precipitates as reddish-brown iron(III) hydroxide. Iron hydroxide can be redissolved by treatment with 2 N HCl. If the hydrochloric acid solution is mixed with a little dilute nitric acid and heated, it is ensured that Fe3+ is present.

Detection of Fe3+ as Berlin blue

In the presence of Fe3+ is present in the hydrochloric acid sample solution, a deep blue compound (Berlin blue) is formed with potassium hexacyanoferrate(II) (yellow blood leach salt).

Detection of Fe2+ as Turnbull’s blue

In the presence of Fe2+ is present in the hydrochloric acid sample solution, a deep blue compound (Turnbull’s blue) is formed with potassium ferricyanide(III) (red blood leach salt). Both reaction products (insoluble Berlin blue and insoluble Turnbulls blue, respectively) are chemically identical. They are the iron(III) salt of hexacyanoferrate(II), Fe4[Fe(CN)6]3 – H2O, which is formed immediately from the reagents used in the Berlin blue reaction, and in the Turnbulls blue reaction after redox reaction of hexacyanoferrate(III), [Fe(CN)6]3-, with iron(II) saline is formed. The blue compound is insoluble in water but often remains colloidal in solution. It consists of octahedral [Fe(CN)6]4--anions, and Fe3+-cations, which are arranged in a crystal lattice in such a way that the cyanoligands are arranged with the C atom on Fe2+– and the N atom to Fe3+-ions point. Voids in the crystal structure are occupied by water molecules. Berliner blue: 4 Fe 3+ +3 [ Fe ( CN ) 6 ] 4- → Fe 4 [ Fe ( CN ) 6 ] 3 Turnbulls blue: 4 Fe 2+ +4 [ Fe ( CN ) 6 ] 3- →4 Fe 3+ +4 [ Fe ( CN ) 6 ] 4- → Fe 4 [ Fe ( CN ) 6 ] 3 +…

If there is so much iron in the analysis that the detection of other ions is disturbed, or so little that the detection of iron appears uncertain, Fe can be3+ can be etherified from a strongly acidic solution in the form of chloroferrates. In this way, Fe3+ is separated from the other ions contained in the urotrope group (Al, Cr, Zr). If necessary, the etheric phase can be concentrated by evaporation of the ether.
A similar behavior is shown by the blood red iron thiocyanato complexes, which is used in the iron detection of Fe3+ with potassium thiocyanate (see below).

Detection of Fe3+ as a red thiocyanato iron complex

A few drops of sample solution are added to one or two drops of an ammonium or potassium thiocyanate solution (thiocyanate = rhodanide) on a white spotting plate. In the presence of Fe3+ -ions, the mixture immediately turns blood red. [Fe(H2O)6]3++ 3SCN- → [Fe(SCN)3(H2O)3]+ 3H2O Since other ions also give colored compounds with thiocyanate, the detection for Fe is not considered specific until the Fe3+ is not considered specific until the solution is completely decolorized when fluoride is added. In this case, the red thiocyanatoiron complex forms the considerably more stable, colorless aquapentafluoroferrate(III) complex, [FeF5(H2O)]2- . [Fe(SCN)3(H2O)3]+ 5F- → [FeF5(H2O)]2-+ 3SCN-+ 2H2O The reliability of iron detection with thiocyanate is also increased if the solubility of the deep red thiocyanatoiron complex in ether is exploited. The above reaction is carried out in a test tube and the solution is covered with diethyl ether. After vigorous shaking and phase separation, observe the extraction of the red thiocyanatoeisen complex into the ether phase.

Encyclopedia of Chemistry: Iron Oxides

Iron Oxides. Iron(II) oxide, black compound (“wüstite phase”) always showing an iron undershoot compared to the formula FeO, of the composition Fe0,9O to Fe0,95O, which is obtained by oxidation of iron with oxygen or water vapor above 566°C. This oxide is stable above 566 °C, metastable at room temperature and can be obtained in the laboratory as a pyrophoric powder by thermal decomposition of iron(II) oxalate in vacuo: FeC2O4 → FeO + CO + CO2. Iron(II,III) oxide, Fe.3O4, most stable iron oxide, deep black, ferromagnetic compound with inverse spinel structure (FeIIFe2IIIO4); d. 5.18 g cm-3, F. 1538 °C (Z.). Fe3O4 is formed by passing water vapor over iron below 566 °C according to 3 Fe + 4 H2O → Fe3O4 + 4 H2 or by vigorous annealing of iron(III) oxide, and is also produced as “hammer blow” during the burning of the iron particles that come off during the forging of iron. In nature, Fe3O4 occurs in large deposits as magnetite (magnetite ironstone) and forms a highly sought-after raw material for iron and steel production. It is used as an electrode material for chlor-alkali electrolysis, as a glass coloring and polishing agent, as a filler and, under the designations iron oxide black or iron black, as a pigment. Iron(III) oxide, Fe2O3, dimorphic compound, d. 5.12 to 5.24 g cm-3, F. 1565 °C. Occurring naturally as hematite in various varieties, α-Fe.2O3 is the stable form (rhombohedral, paramagnetic), while the cubically crystallizing γ-Fe2O3 with careful oxidation of Fe3O4 according to 2 Fe3O4 + O2 → 3 Fe2O3 is formed and, when heated to > 300 °C, is converted into α-Fe2O3 transitions. α-Fe2O3 is also obtained by heating iron(III) oxide hydrate or iron(III) salts of volatile acids. When heated to > 1200 °C in air, Fe.2O3 with oxygen splitting into Fe3O4 when heated. Fe2O3 is used in large quantities as a pigment under the designations iron oxide red or iron red. Annealed Fe2O3 is very hard, so it can be used as a polishing agent for glass, metal and gemstones (polishing red). The above mentioned iron oxide pigments as well as iron oxide yellow (iron hydroxides) are very resistant and have excellent fastness properties. They are suitable for all binders, and also as coloring additives for cement, construction materials and plastics, in ceramics and in the graphics industry. Iron oxide red is also of great importance for rust protection coatings of steel structures and ship hulls. Copyright 1998 Spektrum Akademischer Verlag, Heidelberg

  • The authors

Dr. Andrea Acker, Leipzig Prof. Dr. Heinrich Bremer, Berlin Prof. Dr. Walter Dannecker, Hamburg Prof. Dr. Hans-Günther Däßler, Freital Dr. Claus-Stefan Dreier, Hamburg Dr. Ulrich H. Engelhardt, Braunschweig Dr. Andreas Fath, Heidelberg Dr. Lutz-Karsten Finze, Großenhain-Weßnitz Dr. Rudolf Friedemann, Halle Dr. Sandra Grande, Heidelberg Prof. Dr. Carola Griehl, Halle Prof. Dr. Gerhard Gritzner, Linz Prof. Dr. Helmut Hartung, Halle Prof. Dr. Peter Hellmold, Halle Prof. Dr. Günter Hoffmann, Eberswalde Prof. Dr. Hans-Dieter Jakubke, Leipzig Prof. Dr. Thomas M. Klapötke, Munich Prof. Dr. Hans-Peter Kleber, Leipzig Prof. Dr. Reinhard Kramolowsky, Hamburg Dr. Wolf Eberhard Kraus, Dresden Dr. Günter Kraus, Halle Prof. Dr. Ulrich Liebscher, Dresden Dr. Wolfgang Liebscher, Berlin Dr. Frank Meyberg, Hamburg Prof. Dr. Peter Nuhn, Halle Dr. Hartmut Ploss, Hamburg Dr. Dr. Manfred Pulst, Leipzig Dr. Anna Schleitzer, Marktschwaben Prof. Dr. Harald Schmidt, Linz Dr. Helmut Schmiers, Freiberg Prof. Dr. Klaus Schulze, Leipzig Prof. Dr. Rüdiger Stolz, Jena Prof. Dr. Rudolf Taube, Merseburg Dr. Ralf Trapp, Wassenaar, NL Dr. Martina Venschott, Hannover Prof. Dr. Rainer Vulpius, Freiberg Prof. Dr. Günther Wagner, Leipzig Prof. Dr. Manfred Weißenfels, Dresden Dr. Klaus-Peter Wendlandt, Merseburg Prof. Dr. Otto Wienhaus, Tharandt Expert coordination: Hans-Dieter Jakubke, Ruth Karcher Editors: Sabine Bartels, Ruth Karcher, Sonja Nagel

Chemical name Iron, ion (Fe2+)
IUPACName 15438-31-0
PubChemID 27284
Molecular weight 55.84
PSA 0 ?2
LogP -0.00250
EINECS 215-278-0
Molecular formula Fe+2

Aliases Fe2+ Ferrous Ferrous cation ferrous ion Ferrous ions Iron (II) ion Iron dication Iron divalent ion Iron ion(2+) IRONII 15438-31-0 Structure 15438-31-0 Hazard identification Classification of the substance or mixture No data available Signal word No data available Hazard statement (s) No data available Precautionary statement (s) Prevention: No data available Response: No data available Storage: No data available Disposal: No data available Other hazards not leading to classification No data available 15438-31-0 First aid measures Description of necessary first aid measures General advice: Consult a physician. Show this safety data sheet to the attending physician. If inhaled.: If inhaled, move the person into fresh air. If not breathing, give artificial respiration. Consult a physician. If skin contact: If eye contact: If swallowed: Never give anything by mouth to an unconscious person. Rinse mouth with water. Consult a physician. Most important symptoms / effects, acute and delayed No data available Indication of immediate medical attention and special treatment if necessary. No data available 15438-31-0 Fire-fighting measures Extinguishing media Suitable extinguishing media: use water spray, alcohol resistant foam, dry chemical or carbon dioxide. Specific hazards arising from chemical No data available Special protective measures for firefighters Wear self-contained breathing apparatus for firefighters if necessary. 15438-31-0 Accidental release measures Personal precautions, protective equipment and emergency procedures. zero Environmental precautions Prevent further spills or splashes if safe to do so. Do not allow product to enter drains. Avoid discharge to the environment. Methods and materials for containment and cleanup Arrange for pickup and disposal. Sweep and shovel. Place in suitable closed containers for disposal. 15438-31-0 Handling and storage Precautions for safe handling. Avoid contact with skin and eyes. Avoid formation of dust and aerosols. Avoid exposure-receive special instructions before use. Provide suitable exhaust ventilation in areas where dust is formed. See section 2.2 for precautions. Conditions for safe storage, including any incompatibilities Store in a cool place. Keep container tightly closed in a dry and well ventilated area. 15438-31-0 Exposure Controls / Personal Protection Control Parameters. Occupational exposure limits: no data available Biological exposure limits: no data available Appropriate Engineering Controls Handle in accordance with good industrial hygiene and safety practices. Wash hands before breaks and at the end of the work day. Individual protective measures such as personal protective equipment (PPE) Skin protection: zero Respiratory protection: Wear dust mask when handling large quantities. Thermal hazards: No data available 15438-31-0 Stability and reactivity Reactivity 10.1 Reactivity no data available Chemical stability Stable under recommended storage conditions. Possibility of hazardous reactions No data available Conditions to avoid No data available Incompatible materials No data available Hazardous decomposition products No data available 15438-31-0 Toxicological information Reactivity 10.1 Reactivity no data available Chemical stability Stable under recommended storage conditions. Possibility of hazardous reactions No data available Conditions to avoid No data available Incompatible materials No data available Hazardous decomposition products No data available Acute toxicity Oral: No data available Inhalation: No data available Dermal.: Skin corrosion / irritation No data available Serious eye damage / irritation No data available Respiratory or skin sensitization No data available Germ cell mutagenicity No data available Carcinogenicity No data available Reproductive toxicity No data available STOT single exposure No data available STOT-repeated exposure No data available Aspiration hazard No data available 15438-31-0 Ecological information Toxicity Toxicity to fish: no data available Toxicity to daphnia and other aquatic invertebrates: no data available Toxicity to algae: no data available Toxicity to microorganisms: no data available Persistence and degradation No data available Bioaccumulative potential No data available Mobility in soil No data available Other side effects No data available 15438-31-0 Disposal considerations Disposal methods Product: Material may be disposed of by removal to a licensed chemical destruction facility or by controlled incineration with flue scrubbing. Do not contaminate water, food, feed or seed by storage or disposal. Do not discharge into sewer systems. Contaminated packaging: Containers may be triple rinsed (or equivalent) and offered for recycling or reprocessing. Alternatively, the packaging can be punched to render it unusable for other purposes and then disposed of in a sanitary landfill. Controlled incineration with flue gas scrubbing is available for combustible packaging materials. 15438-31-0 Transport information UN number ADR / RID: no data available IMDG: no data available IATA: no data available UN proper shipping name ADR / RID: no data available IMDG: no data available IATA: no data available Transport hazard class (es) ADR / RID: no data available IMDG: no data available IATA: no data available Packing group, if applicable ADR / RID: no data available IMDG: no data available IATA: no data available Environmental hazards ADR / RID: No IMDG: No IATA: No Special precautions for user No data available Transport in bulk according to Annex II MARPOL 73 / 78 and IBC Code No data available Fe2 Chemical Name.

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