Blue powder

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The nitrides of Groups 4(IVB) and 5(VB) elements form at ca 1200°C. The nitrides of magnesium and aluminum form at 800°C. Aluminum nitride, obtained by beating aluminum powder in the presence of ammonia or nitrogen at 800—1000°C, is formed as a white to grayish blue powder. A grade of... 

Carbon monoxide and dioxide oxidize zinc vapor below 1100—1300°C although only the carbon dioxide reaction is significant. Rapid condensation of the zinc vapor avoids the formation of ziac-oxide-coated droplets, so-called blue powder. 

The Weaton-Najarian zinc condenser was commercialized in 1936. The condenser and cooling well of the electrothermic furnace hold 48 t of molten zinc. Hot zinc-laden gases bubble through the zinc in the condenser and cause rapid circulation through the cooling well which is kept at 480—500°C by water coils. The off-gases are scmbbed and burned for fuel value. Scmbber water is ponded to recover blue powder. 

Poussiere, /. Zinc) blue powder, poussieren, v.t. push, promote court. 

Schmelz, m. enamel, glaze fusion, melting, melt (Zinc) blue powder. 

Carefully scrape the separated bromophenol blue spots on to a sheet of clean smooth-surfaced paper using a narrow spatula (this is easier if two grooves are made down to the glass on either side of the spots). Pour the blue powder into a small centrifuge tube, add 2 mL of ethanol, 5 drops of 0.880 ammonia solution, and stir briskly until the dye is completely extracted. Centrifuge and remove the supernatant blue solution from the residual white powder. Repeat this procedure with the separated Congo red and phenol red spots . 

A mixture of Nd(OAc)3 (0.21 g, 1 mmol) and 4-/er/-hutylphthalonitriIe (7 1.47 g, 8 mmol) was fused in an evacuated glass ampule with gradual raising of the temperature to 290 JC and this temperature was then maintained for 2 h. The cooled melt was ground and purified by column chromatography (alumina, benzene) to ohtain a blue powder yield 1.03 g (60%). 

Trifluoromethyl)isoindolinediimine (1.0 g, 4.7 mmol) was refluxed in Me2N(CH2)2OH (10 mL) for 7 h. After cooling, the mixture was diluted with H20 and filtered. The residue was washed with MeOH until the filtrate was colorless. The deep-blue powder was dried at 110 C for 1 h yield 620mg (67%). 

Trifluoromethyl)isoindolinediimine (3.0g. 14.1 mmol) and GcC14 (3.0g, 14.0mmol) were refluxed in quinoline (30 mL) for 4h. After cooling overnight, the precipitate was filtered, washed with HC1, H20, acetone, and McOH. The residue was dried and extracted with benzene to give a blue powder yield 1.88 g (58%). 

Patent Blue V (E 131, Cl Food Blue 5, Patent Blue 5) is a triarylmethane dye, the calcium or sodium salt of 2-[(4-diethylaminophenyl)(4-diethylimino-2,5-cyclo-hexadien-l-ylidene)methyl]-4-hydroxy-l,5-benzenedisulfonate. It is a dark-blue powder, soluble in water, slightly soluble in ethanol. The absorption maximum is 638 nm in water, pH 5, with = 2000. Patent blue is not permitted for use as... 

Zinc is a bluish-white metal which dissolves readily in strong acids. In nature it occurs as a sulfide, oxide, or carbonate. In solution, it is divalent and can form hydrated Zn2+ cations in acids, and zincated anions — probably Zn(OH)42 — in strong bases (USEPA 1980, 1987). Zinc dust and powder are sold commercially under a variety of trade names Asarco, Blue powder, Cl 77949, Cl pigment metal 6, Emanay zinc dust, granular zinc, JASAD Merrillite, LI 5, and PASCO (USPHS 1989). Selected physical and chemical properties of zinc, zinc chloride, and zinc sulfate are listed in Table 9.2. 

Neodymium oxide (Nd O ) is a light-blue powder used to color glass and as a pigment for ceramics. It is also used to make color TV tubes. 

Dark-blue powder or lumps density 1.80 g/cm dehydrates and partially decomposes around 250°C insoluble in water, dilute acids and most organic solvents. 

Blue powder hexagonal crystals fluoresces red density 7.24 g/cm melts around 1,900°C practically insoluble in water, 30 mg/L at 75°C dissolves in acids. 

Potassium hexacyanochromate(III) is available by a literature method.A solution of [Cu(tren)(0H2)][C104]2 is prepared by mixing aqueous solutions of Cu(C104)2 6H20 (2.60 g, 7.00 mmol) in 20 mL of water and tren (1.02g, 6.98 mmol) in 10 mL of water. The dropwise addition of a hexacyanochromate(III) solution, prepared by dissolving 0.38 g of K3[Cr(CN)6] (1.16 mmol) in 15 mL of water, to the copper solution results in the immediate formation of a turquoise precipitate. Once the addition is complete, the precipitate is collected by filtration washed successively with cold water, ethanol, and ether and then air-dried to afford a blue powder of [ Cu(tren)(CN) 6Cr][C104]9 H2O Yield 1.50 g, 55%. 

Anhj drous cupric chloride, like anhydrous cupric sulphate, absorbs ammonia rapidly the absorption is accompanied by increase in bulk, and the brown chloride changes to a blue powder having the composition CuCl2.6NtI3. The following compounds of cupric chloride with ammonia are known —... 

Hexammino-cupric Chloride, [Cu(NH3)6]Cl2.—This salt was prepared by Faraday in ISIS by allowing ammonia gas to act upon fused cuprie chloride. Increase in bulk immediately took place and a blue powder was formed. The compound may be conveniently prepared by allowing dry ammonia to act on a solution of the cupric salt in ethyl acetate, when a green precipitate of hexammino-chloride is formed which is washed with ethyl acetate and dried.1 The same compound is obtained by the action of liquid ammonia on anhydrous cupric chloride previously saturated with ammonia gas.2... 

It is a light blue powder, which becomes red on exposure to moist air or on solution in water. 

Zn vapor must be condensed below 415° in a stream of inert gas (ie, nitrogen) for the Zn dust to be formed (blue powder, Zn fume). Above 415° Zn condenses as the liq. Zn is more electropositive than hydrogen, nevertheless it can be successfully electrodeposited from an aq soln at high current densities owing to the high hydrogen overvoltage on Zn (Ref 15)... 

Tartrate of Copper—2 CuO, Cs K4 Ow, 6 HO— by precipitation of acetate of copper with tartaric acid. A very light blue powder, sobible in one thousand seven hundred parta of cold water. 

Rammelsberg21 analyzed a blue powder used as a pigment in an ancient Egyptian tomb, and found it to consist of silica 70.50 per cent lime 8.53 per cent copper oxide 13.00 per cent ferric oxide 3.71 per cent magnesium oxide 4.18 per cent. 

A fine, dark-blue powder, containing at least 95 per cent of indigo blue. 

Purple, rhombic crystals with coppery luster, or dark-blue powder with a reddish tint, which, on pressure or rubbing, cxliibits a coppery luster. Indigo blue is insoluble in water, alcohol, ether, dilute acids, and alkalies. It dissolves in If) parts of concentrated sulphuric acid, or 5 parts of fuming sulphuric acid, with the formation of indigo sulphonic acids. 

Bent Talley. Explosives, patented in 1909(USP 943589), included several formulations, among them AN 50-80, NG 2-10, Mn dioxide 7-20, comminuted Zn( blue powder ) 7.2-23.5 Zn oxide 0,8-2.5%. They might also contain starch, charcoal, MNN, PA, etc... 

For each student group 14.65 g NaC2H302 (sodium acetate) three large test tubes test tube holder Bunsen burner or alcohol lamp matches Celsius thermometer distilled water red or blue powdered paint pigment stirring rod test tube rack 10.0 ml graduated cylinder centigram balance paintbrushes 5-x-7-in. watercolor paper. 

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