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Chromium dihydrate

The CASS Test. In the copper-accelerated acetic acid salt spray (CASS) test (42), the positioning of the test surface is restricted to 15 2°, and the salt fog corrosivity is increased by increasing temperature and acidity, pH about 3.2, along with the addition of cupric chloride dihydrate. The CASS test is used extensively by the U.S. automobile industry for decorative nickel—chromium deposits, but is not common for other deposits or industries. Exposure cycle requirements are usually 22 hours, rarely more than 44 hours. Another corrosion test, now decreasing in use, for decorative nickel—chromium finishes is the Corrodkote test (43). This test utilizes a specific corrosive paste combined with a warm humidity cabinet test. Test cycles are usually 20 hours. [Pg.151]

Chromium (II) chloride (anhydrous) [10049-05-5] M 122.9, m 824 , d]" 2.75, Obtained from the dihydrate by heating in vacuo at 180°. It is a very hygroscopic white powder which dissolves in H2O to give a sky blue solution. Stable in dry air but oxidises rapidly in moist air and should be stored in air tight containers. It sublimes at 800° in a current of HCl gas and cooled in the presence of HCl gas. Alternatively it can be washed with air-free Et20 and dried at 110-120°. [Inorg Synth 3 150 1950.]... [Pg.413]

Chromium, tetraaquadichloro-chloride dihydrate hydrate isomerism, 1, 183 Chromium, tetrabromo-solvated, 3, 758 synthesis, 3, 763 Chromium, tetrachloro-antiferromagnetic, 3, 761 ferromagnetic magnetic properties, 3,7559 optical properties, 3,759 structure, 3,759 solvated, 3. 758 synthesis. 3, 759 Chromium, tetrachlorooxy-tetraphenylarsenate stereochemistry, 1,44 Chromium, tetrahalo-, 3,889 Chromium, tetrakis(dioxygen)-stereochemistry, 1,94 Chromium, triamminediperoxy-structure. 1, 78 Chromium, tricyanodiperoxy-structure, 1, 78 Chromium, trifluoro-electronic spectra, 3, 757 magnetic properties, 3, 757 structures, 3, 757 synthesis, 3, 756 Chromium, trihalo-clcctronic spectra, 3, 764 magnetic properties, 3, 764 structure, 3, 764 synthesis, 3, 764 Chromium, tris(acetylacetone)-structure. 1, 65 Chromium, tris(bipyridyl)-... [Pg.101]

An autoclave (Note 1) is charged with 200 g. (1.28 moles) of 2,3-dimethylnaphthalene (Note 2), 940 g. (3.14 moles, 23% excess) of sodium dichromate dihydrate, and 1.8 1. of water. The autoclave is closed, heated to 250°, and shaken continuously at this temperature for 18 hours. The autoclave is cooled with continued agitation (Note 3), the pressure is released, and the autoclave is opened. The contents are transferred to a large vessel (Note 4). To effect complete transfer, the autoclave is rinsed with several 500-ml. portions of hot water. Green hydrated chromium oxide in the reaction mixture is separated on a large Buchner funnel and washed with warm water until the filtrate is colorless. The combined filtrates (7-8 1.) are acidified with 1.3 1. of 6N hydrochloric acid. The acidified mixture is allowed to... [Pg.80]

C03-0015. Determine the chemical formulas of barium chloride dihydrate, chromium(III) hydroxide, and sulfur trioxide. [Pg.148]

Chromium(III) acetate, 6 533 Chromium(II) acetate dihydrate, physical properties, 6 528t... [Pg.183]

Chromium(VI) oxide is prepared by heating sodium dichromate dihydrate with a slight excess of sulfuric acid in a steel tank or cast iron container ... [Pg.226]

Synonym Gamma-Chloropropylene Oxide 3-Chloro-1,2-Propylene Oxide Chlorosulfonic Acid Chlorothene Chiorotoluene, Alpha Alpha-Chlorotoluene Omega-Chlorotoluene Chlorotrifluoroethylene Chlorotrimethylsilane Chlorsulfonic Acid Clilorylen Clip Chromic Acid Chromic Anhydride Chromic Oxide Chromium (VI) Dioxychloride Chromium Oxychloride Chromium Trioxide Chromyl Chloride Cianurina Citric Acid Citric Acid, Diammonium Salt Clarified Oil Clorox Cc Ral Coal Tar Oil Cobalt Acetate Cobalt Acetate Tetrahydrate Cobalt (II) Acetate Cobalt Chloride Cobalt (II) Chloride Cobaltous Acetate Cobaltous Chloride Cobaltous Chloride Dihydrate Cobaltous Chloride Hexahydrate Cobaltous Nitrate Cobaltous Nitrate Hexahydrate Cobaltous Sulfate Heptahydrate Cobalt Nitrate Cobalt (II) Nitrate Cobalt Sulfate Compound Name Epichlorohydrin Epichlorohydrin Chlorosulfonic Acid Trichloroethane Benzyl Chloride Benzyl Chloride Benzyl Chloride Trifluorochloroethylene Trimethylchlorosilane Chlorosulfonic Acid Trichloroethylene Cumene Hydroperoxide Chromic Anhydride Chromic Anhydride Chromic Anhydride Chromyl Chloride Chromyl Chloride Chromic Anhydride Chromyl Chloride Mercuric Cyanide Citric Acid Ammonium Citrate Oil Clarified Sodium Hypochlorite Coumaphos Oil Coal Tar Cobalt Acetate Cobalt Acetate Cobalt Acetate Cobalt Chloride Cobalt Chloride Cobalt Acetate Cobalt Chloride Cobalt Chloride Cobalt Chloride Cobalt Nitrate Cobalt Nitrate Cobalt Sulfate Cobalt Nitrate Cobalt Nitrate Cobalt Sulfate... [Pg.35]

Chromium(II) double sulfates can be crystallized by the addition of ethanol to concentrated aqueous solutions containing equimolar quantities of the components. The hexahydrates A2S04>CrS04-6H20 (A = NH4, Rb or Cs) are high-spin and have reflectance spectra compatible with the presence of tetragonally distorted [Cr(H20)6]2+ ions (Table 24). 4 The potassium and sodium salts crystallize as pale blue dihydrates with similar properties, and from the splittings of the SO2- absorption bands in their IR spectra it seems that coordinated sulfate anions are present. [Pg.736]

Sodium bis(L-cysteinato)chromate(III) dihydrate has been prepared by refluxing L-cysteine with chromium(III) nitrate and neutralizing the solution.1185. The product is a dark blue solid in which cysteine is coordinated with the sulfur atoms trans (see 252-254). A number of chloro and other complexes of cysteine and related amino acids have been studied.1186 A related complex L-histidinato-D-penicillaminatochromium(III) has been prepared11 7 and its crystal structure reported. [Pg.904]

Answer (a) Iron(II) chloride dihydrate (b) aluminum bromide (c) chromium(II) chlorate]... [Pg.70]

Aqua-1,2-diaminoethanediperoxochromium(IV), 0961 Aqua-1,2-diaminopropanediperoxochromium(IV) dihydrate, 1332 fraws-Aquadioxo(terpyridine)ruthenium(2+) diperchlorate, 3680 Aquafluorobis(l, lO-phenanthroline)chromium(III) perchlorate, 3840 Aquaglycinatonitratocopper, see Copper(II) glycinate nitrate, 0901 Argon, 0091 Arsenic, 0092 Arsenic pentaazide, 0103b Arsenic pentafluoride, 0095a Arsenic pentaoxide, 0106 Arsenic trichloride, 0094 Arsenic trioxide, 0105 Arsenic trisulfide, 0108 Arsenous triazide, see Triazidoarsine, 0103a Arsine—boron tribromide, 0101 f Arsine, 0100... [Pg.2046]

Information regarding gastrointestinal effects in animals after inhalation exposure to chromium or its compounds is limited. Histological examination of the stomachs of rats exposed to sodium dichromate dihydrate at 0.2 mg chromium(VI)/m3 for 28 or 90 days revealed no abnormalities (Glaser et al. 1985). In mice exposed intermittently to 4.3 mg chromium(VI)/m3 as calcium chromate for 18 months, small ulcerations in the stomach and intestinal mucosa were reported to occur occasionally, but the incidence in the treated mice, in controls, or other details regarding these lesions were not reported (Nettesheim et al. 1971). No treatment-related histopathological lesions were found in the stomach, large intestine, duodenum, jejunum, or ileum of rats chronically exposed to chromium dioxide at 15.5 mg chromium(IV)/m3 (Lee et al. 1989). [Pg.66]

Characteristic Potassium dichromate (Chromium(VI)) Sodium chromate (Chromium(VI)) Sodium dichromate, dihydrate (Chromium(VI))... [Pg.309]

The following compounds were used as supplied cyclopropylcarbinol (Aldrich Chemical Company, Inc. or Fluka AG, 95% pure), hydrochloric acid (Fisher Reagent, 36.5-38%), chromium trioxide (Fisher Certified), oxalic acid dihydrate (Fisher Certified), methylene chloride (Fisher Certified). [Pg.12]

For substrates that will withstand it, Czeraecki and coworkers have developed a woik-up procedure for PDC reactions that should be iq>plicable to other reagents.Oxalate is known to be a very good ligand for chromium(in). Thus treatment of a reaction mixture with an aqueous solution of oxalic acid dihydrate and anunonium oxalate monohydrate readily removes residual chromium(ni) salts. This procedure is particularly useful for large scale reactions. [Pg.276]


See other pages where Chromium dihydrate is mentioned: [Pg.132]    [Pg.457]    [Pg.239]    [Pg.707]    [Pg.758]    [Pg.822]    [Pg.263]    [Pg.267]    [Pg.269]    [Pg.1058]    [Pg.50]    [Pg.142]    [Pg.1058]    [Pg.86]    [Pg.64]    [Pg.155]    [Pg.186]    [Pg.188]    [Pg.21]    [Pg.48]    [Pg.51]   
See also in sourсe #XX -- [ Pg.27 , Pg.309 ]

See also in sourсe #XX -- [ Pg.27 , Pg.309 ]

See also in sourсe #XX -- [ Pg.27 , Pg.309 ]




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Dihydrate)

Dihydrates

Tetraaquabis(l,2-benzisothiazol-3(2H)-one 1,1-dioxidato)chromium(II) Dihydrate

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