Iron(II) sulfide or ferrous sulfide (Br.E. sulphide) is one of a family of chemical compounds and minerals with the approximate formulaFeS. Iron sulfides are often iron-deficient non-stoichiometric. All are black, water-insoluble solids.
Iron(II) sulfide
Names
Other names
Iron sulfide, ferrous sulfide, black iron sulfide, protosulphuret of iron
As organic matter decays under low-oxygen (or hypoxic) conditions such as in swamps or dead zones of lakes and oceans, sulfate-reducing bacteria reduce various sulfates present in the water, producing hydrogen sulfide. Some of the hydrogen sulfide will react with metal ions in the water or solid to produce iron or metal sulfides, which are not water-soluble. These metal sulfides, such as iron(II) sulfide, are often black or brown, leading to the color of sludge.
When eggs are cooked for a long time, the yolk's surface may turn green. This color change is due to iron(II) sulfide, which forms as iron from the yolk reacts with hydrogen sulfide released from the egg white by the heat.[3] This reaction occurs more rapidly in older eggs as the whites are more alkaline.[4]
^Belle Lowe (1937), "The formation of ferrous sulfide in cooked eggs", Experimental cookery from the chemical and physical standpoint, John Wiley & Sons
iron, sulfide, redirects, here, other, uses, disambiguation, ferrous, sulfide, sulphide, family, chemical, compounds, minerals, with, approximate, formula, iron, sulfides, often, iron, deficient, stoichiometric, black, water, insoluble, solids, names, other, n. FeS redirects here For other uses see FES disambiguation Iron II sulfide or ferrous sulfide Br E sulphide is one of a family of chemical compounds and minerals with the approximate formula FeS Iron sulfides are often iron deficient non stoichiometric All are black water insoluble solids Iron II sulfide Names Other names Iron sulfide ferrous sulfide black iron sulfide protosulphuret of iron Identifiers CAS Number 1317 37 9 Y 3D model JSmol Interactive image ChemSpider 8466211 Y ECHA InfoCard 100 013 881 PubChem CID 10290742 UNII TH5J4TUX6S Y CompTox Dashboard EPA DTXSID5061665 InChI InChI 1S Fe S q 2 2 YKey GNVXPFBEZCSHQZ UHFFFAOYSA N YInChI 1 Fe S q 2 2Key GNVXPFBEZCSHQZ UHFFFAOYAC SMILES Fe 2 S 2 Properties Chemical formula FeS Molar mass 87 910 g mol Appearance Grey sometimes in lumps or powder Density 4 84 g cm3 Melting point 1 194 C 2 181 F 1 467 K Solubility in water negligible insoluble Solubility reacts in acid Magnetic susceptibility x 1074 10 6 cm3 mol Hazards Occupational safety and health OHS OSH Main hazards Source of hydrogen sulfide can be pyrophoric NFPA 704 fire diamond 122 Autoignitiontemperature variable Related compounds Other anions Iron II oxideIron II selenideIron II telluride Other cations Manganese II sulfideCobalt II sulfide Related Iron sulfides Iron III sulfide Except where otherwise noted data are given for materials in their standard state at 25 C 77 F 100 kPa Y verify what is Y N Infobox references Contents 1 Preparation and structure 2 Reactions 3 Biology and biogeochemistry 4 See also 5 ReferencesPreparation and structure editFeS can be obtained by the heating of iron and sulfur 1 Fe S FeS FeS adopts the nickel arsenide structure featuring octahedral Fe centers and trigonal prismatic sulfide sites Reactions editIron sulfide reacts with hydrochloric acid releasing hydrogen sulfide 2 FeS 2 HCl FeCl2 H2S FeS H2SO4 FeSO4 H2S In moist air iron sulfides oxidize to hydrated ferrous sulfate Biology and biogeochemistry edit nbsp An overcooked hard boiled egg showing the distinctive green coating on the yolk caused by the presence of iron II sulfide Iron sulfides occur widely in nature in the form of iron sulfur proteins As organic matter decays under low oxygen or hypoxic conditions such as in swamps or dead zones of lakes and oceans sulfate reducing bacteria reduce various sulfates present in the water producing hydrogen sulfide Some of the hydrogen sulfide will react with metal ions in the water or solid to produce iron or metal sulfides which are not water soluble These metal sulfides such as iron II sulfide are often black or brown leading to the color of sludge Pyrrhotite is a waste product of the Desulfovibrio bacteria a sulfate reducing bacteria When eggs are cooked for a long time the yolk s surface may turn green This color change is due to iron II sulfide which forms as iron from the yolk reacts with hydrogen sulfide released from the egg white by the heat 3 This reaction occurs more rapidly in older eggs as the whites are more alkaline 4 The presence of ferrous sulfide as a visible black precipitate in the growth medium peptone iron agar can be used to distinguish between microorganisms that produce the cysteine metabolizing enzyme cysteine desulfhydrase and those that do not Peptone iron agar contains the amino acid cysteine and a chemical indicator ferric citrate The degradation of cysteine releases hydrogen sulfide gas that reacts with the ferric citrate to produce ferrous sulfide See also editIron sulfide Troilite Pyrite Iron sulfur world theoryReferences edit H Lux Iron II Sulfide in Handbook of Preparative Inorganic Chemistry 2nd Ed Edited by G Brauer Academic Press 1963 NY Vol 1 p 1502 Hydrogen Sulfide Generator Belle Lowe 1937 The formation of ferrous sulfide in cooked eggs Experimental cookery from the chemical and physical standpoint John Wiley amp Sons Harold McGee 2004 McGee on Food and Cooking Hodder and Stoughton Retrieved from https en wikipedia org w index php title Iron II sulfide amp oldid 1181858042, wikipedia, wiki, book, books, library,
