sulfure de chrome iii

42% or 50% may be obtained by the addition of sodium carbonate, these are often used in combination with sodium formate. Additionally, ill-defined but commercially important "basic chromium sulfates" are known. Evaporation of these acidic solutions affords the hydrate salt described … Caractéristiques de l'exposition . Les concentrations de composés de chrome III présentes et la durée de l'exposition ne sont pas toujours mentionnées dans les études. Chromium(III) Sulfide is the inorganic compound with the formula Cr 2 S 3. No predicted properties have been calculated for this compound. Similarly, dissolution of chrome alloys gives chromium sulfate together with ferrous sulfate. Mise à jour : 2018-04-12. [Cr+3] [4][5] The reduction could formally be written: Since 33% of the anion charges are due to hydroxy ions the basicity is 33% (but in tanning jargon it is known as 33% reduced). These salts are usually either violet or green solids that are soluble in water. Chromium(III) sulfide can be prepared through the reaction of a stoichiometric mixture of the elements at 1000 °C[2], It is a solid that is insoluble in water. The sodium sulfate is often left in the technical product since it is inert with respect to the tanning process. National Institute for Occupational Safety and Health, https://en.wikipedia.org/w/index.php?title=Chromium(III)_sulfide&oldid=937595676, Articles containing unverified chemical infoboxes, Creative Commons Attribution-ShareAlike License, This page was last edited on 26 January 2020, at 00:53. CopyCopied, InChI=1S/2Cr.3S/q2*+3;3*-2 Covington, A. D.; Lampard, G. S.; Menderes, O.; Chadwick, A. V.; Rafeletos, G.; O'Brien, P. "Extended X-ray absorption fine structure studies of the role of chromium in leather tanning" Polyhedron 2001, volume 20, 461–466. Preparation. Jellinek, F. "The structures of the Chromium Sulphides" Acta Crystallographica 1957, volume 10, p620-p628. Most important commercially is basic chromium sulfate, which is thought to be [Cr2(H2O)6(OH)4]SO4 (CAS#39380-78-4). Chromium(III) sulfate hydrate is widely used in making chrome tanned leather, paints, inks and ceramics. It can be synthesized by reacting sulfur dioxide with potassium dichromate (dissolved in sulfuric acid) at -38°C. Some metal-metal bonding is indicated by the short Cr-Cr distance of 2.78 Å. It is involved in the preparation of chrome catalyst. dichromium trisulph ide. En milieu de travail, l'exposition au sulfate de chrome (III) anhydre se fait par les poussières ou les poudres. Ce produit est inodore. Le sulfate de chrome (III) anhydre est un solide poudreux de couleur pêche. CopyCopied, DBULDCSVZCUQIR-UHFFFAOYSA-N Il … Georg Brauer: Handbuch der präparativen anorganischen Chemie. The most useful source of chromium(III) sulfate are the Cr(III) wastes from the chromate oxidation of various organic compounds. Notes. Products with higher basicities, e.g. Chromium(III) sulfate usually refers to the inorganic compounds with the formula Cr2(SO4)3.x(H2O), where x can range from 0 to 18. CS1 maint: multiple names: authors list (, National Institute for Occupational Safety and Health, "Structure de l'Hydroxysulfate de Chrome monohydrate", Ullmann's Encyclopedia of Industrial Chemistry, https://en.wikipedia.org/w/index.php?title=Chromium(III)_sulfate&oldid=973649778, Chemical articles with multiple compound IDs, Multiple chemicals in an infobox that need indexing, Chemical articles with multiple CAS registry numbers, Articles with changed ChemSpider identifier, Pages using collapsible list with both background and text-align in titlestyle, Articles containing unverified chemical infoboxes, Creative Commons Attribution-ShareAlike License, reddish-brown crystals (anhydrous), purple crystals (hydrated), This page was last edited on 18 August 2020, at 12:12. Chromium(III) Sulfide is the inorganic compound with the formula Cr2S3. A chromium(III) oxide coproduct is generated which is readily extracted into sulfuric acid. Il est inodore. Click to predict properties on the Chemicalize site, For medical information relating to Covid-19, please consult the, ACD/Labs Percepta Platform - PhysChem Module, Compounds with the same molecular formula, Search Google for structures with same skeleton. Extraction of chromite ore with sulfuric acid in the presence of some chromate gives solutions of chromium(III) sulfate contaminated with other metal ions. Chromium sulfides are usually nonstoichiometric compounds, with formulas ranging from CrS to Cr 0.67 S (corresponding to Cr 2 S 3). It is also used in preparation of chromium metal, dye, in printing and dyeing industry. InChI=1S/2Cr.3H2O4S.12H2O/c;;3*1-5(2,3)4;;;;;;;;;;;;/h;;3*(H2,1,2,3,4);12*1H2/q2*+3;;;;;;;;;;;;;;;/p-6, InChI=1/2Cr.3H2O4S.12H2O/c;;3*1-5(2,3)4;;;;;;;;;;;;/h;;3*(H2,1,2,3,4);12*1H2/q2*+3;;;;;;;;;;;;;;;/p-6, [Cr+3].[Cr+3].[O-]S(=O)(=O)[O-].[O-]S([O-])(=O)=O. [S-2].[S-2].[S-2].[Cr+3]. CopyCopied, CSID:140177, http://www.chemspider.com/Chemical-Structure.140177.html (accessed 01:23, Nov 6, 2020) According to X-ray crystallography, its is a combination of that of nickel arsenide (1:1 stoichiometry) and Cd(OH)2 (1:2 stoichiometry). 3., umgearb. Auflage. DE2635086A1 DE19762635086 DE2635086A DE2635086A1 DE 2635086 A1 DE2635086 A1 DE 2635086A1 DE 19762635086 DE19762635086 DE 19762635086 DE 2635086 A DE2635086 A DE 2635086A DE 2635086 A1 DE2635086 A1 DE 2635086A1 Authority DE Germany Prior art keywords iii oxide process low sulfur producing low Prior art date 1976-08-04 Legal status (The legal status is an … CopyCopied, Validated by Experts, Validated by Users, Non-Validated, Removed by Users, Predicted data is generated using the ACD/Labs Percepta Platform - PhysChem Module. [3], Except where otherwise noted, data are given for materials in their. Enke, Stuttgart 1981. It is a brown-black solid. Pour les substances peu solubles, le pK s à 25 °C est donné. The most useful source of chromium(III) sulfate are the Cr(III) wastes from the chromate oxidation of various organic compounds. Other chromium(III) hydroxides have been reported.[3]. Chromium(III) potassium sulfate dodecahydrate (Potassium chromium(III) sulfate dodecahydrate, Chrome alum) is widely used chemical in dyeing and textile industry. DICHROMIUM(3+) ION TRISULFANEDIIDE. Basic chromium sulfate is produced from chromate salts by reduction with sulfur dioxide, although other methods exist. Anthroquinone and quinone are produced on large scale by treatment of anthracene and phenol with chromic acid. Hygroscopic, moisture sensitive. Three chromium(III) sulfates are well characterized: A variety of other chromium(VI) sulfates are known, but also contain hydroxide or oxide ligands. It is important to fully reduce the hexavalent chromium to trivalent since the hexavalent is more likely to cause health problems for tanners and leather consumers. La solubilité est exprimée en général en grammes de soluté par cent grammes de solvant.. Cette liste répertorie les solubilités dans l’eau (en g/100 g d'eau) de substances salines en fonction de la température, sous une pression d'une atmosphère. [2] It results from the partial neutralization of the hexahydrates. Keep the container tightly closed in a dry and well-ventilated place. Chromium sulfides are usually nonstoichiometric compounds, with formulas ranging from CrS to Cr0.67S (corresponding to Cr2S3). It is commonly used in tanning leather. Evaporation of these acidic solutions affords the hydrate salt described above. Seule l'utilisation d'un instrument de mesure permet de l'identifier et d'en quantifier la concentration. The hydrated salts of chromium sulfate can also be produced, albeit impure, by extraction of various other chromium compounds, but these routes are not economically viable.. Chrom (3+)sulfid (2: 3) ... (2:3) [ACD/IUPAC Name] Sulfure de chrome(3 +) (3:2) [French] [ACD/IUPAC Name] 12018-22-3 [RN ] 234 ... chromium sulfide (C r2S3) Chromium(III) sulfi de. [O-]S([O-])(=O)=O.O.O.O.O.O.O.O.O.O.O.O.O, Except where otherwise noted, data are given for materials in their. A chromium(III) oxide coproduct is generated which is readily extracted into sulfuric acid. Band III. Quelques études effectuées en milieu de travail ont montré que l'exposition chronique aux composés de chrome III peut causer de la toux, une production de mucus abondante, des amygdalites chroniques, des rhinites, des bronchites chroniques ou un essouflement à l'effort. Anthroquinone and quinone are produced on large scale by treatment of anthracene and phenol with chromic acid. Predicted - ACD/Labs; Predicted - ChemAxon; Predicted data is generated using the ACD/Labs Percepta Platform - PhysChem Module. It is a brown-black solid.

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