Cobalt hydroxides

The following simple test distinguishes fructose from all other carbohydrates. Upon heating a little fructose with dilute cobalt chloride solution, cooling and treating with a little ammonia solution, a violet to purple colour is developed, - the colour gradually fades and must be observed immediately after the addition of the ammonia solution. Green cobalt hydroxide is formed with all other carbohydrates. 

Unmodified Cobalt Process. Typical sources of the soluble cobalt catalyst include cobalt alkanoates, cobalt soaps, and cobalt hydroxide [1307-86 ] (see Cobalt compounds). These are converted in situ into the active catalyst, HCo(CO)4, which is in equihbrium with dicobalt octacarbonyl... 

Basic oxides of metals such as Co, Mn, Fe, and Cu catalyze the decomposition of chlorate by lowering the decomposition temperature. Consequendy, less fuel is needed and the reaction continues at a lower temperature. Cobalt metal, which forms the basic oxide in situ, lowers the decomposition of pure sodium chlorate from 478 to 280°C while serving as fuel (6,7). Composition of a cobalt-fueled system, compared with an iron-fueled system, is 90 wt % NaClO, 4 wt % Co, and 6 wt % glass fiber vs 86% NaClO, 4% Fe, 6% glass fiber, and 4% BaO. Initiation of the former is at 270°C, compared to 370°C for the iron-fueled candle. Cobalt hydroxide produces a more pronounced lowering of the decomposition temperature than the metal alone, although the water produced by decomposition of the hydroxide to form the oxide is thought to increase chlorine contaminate levels. Alkaline earths and transition-metal ferrates also have catalytic activity and improve chlorine retention (8). 

Cobalt(II) acetylacetonate [14024-48-7] cobalt(II) ethyUiexanoate [136-52-7] cobalt(II) oleate [14666-94-5] cobalt(II) linoleate [14666-96-7] cobalt(II) formate [6424-20-0], and cobalt(II) resinate can be produced by metathesis reaction of cobalt salt solutions and the sodium salt of the organic acid, by oxidation of cobalt metal in the presence of the acid, and by neutralization of the acid using cobalt carbonate or cobalt hydroxide. 

Kobaltoxyd, n. cobalt oxide, specif, cobaltic oxide, cobalt(III) oxide, -hydrat, n. cobalt hydroxide, -oxydul, n. cobaltocobaltic oxide, cobalt(II,III) oxide. 

The catalyst is a cobalt carbonyl that is prepared in situ from cobaltous hydroxide, and nonylpyridine is the promotor. Oxidation of the aldehyde produces 3-hydroxypropionic acid. 1,3-Propanediol and 3-hydroxypropi-onic acid could also be produced from acrolein (Chaper 8). ... 

During this reaction, cobaltous sulfate produces intermediates of cobaltic sulfate [Co2(S04)3] and cobaltous hydroxide [Co(OH)2] before reforming as cobaltous sulfate. 

Catalyzed sodium sulfite should be fed separately from other treatments and inhibitors (via a stainless steel injection quill) because the presence of other alkaline treatments causes the cobalt to precipitate as cobaltous hydroxide in the tank. 

D.19 You come across some old bottles in a storeroom that are labeled (a) cobaltic oxide monohvdrate, (b) cobaltous hydroxide. Using Appendix 3C as a guide, write their modern names and chemical formulas. 

Miscellaneous copper oxide and cobalt hydroxide cements... 

Cobalt glass, color, 7 331 CobaltCII) hexaaquo ion, 7 229 Cobalt hexahydrate, analysis, 7 237t Cobalt high temperature alloys, 7 223-224 Cobalt hydroxide, analysis, 7 237t Cobalt(II) hydroxide, 7 230 uses, 7 240t... 

The intensities for the high mass manganese ions for the pH 10 Co(II)-birnessite material are reduced compared to intensities in Na-birnessite, or in the pH 7 Co(II)-birnessite sample, while the cobalt-containing species are the dominant ions. The results indicate a surface coating of cobalt-containing species, perhaps cobalt hydroxide or cobalt oxyhydroxide. A comparison of the pH 10 Co(II)-birnessite results with data for the reference cobalt compounds reveals ions similar to those found in Co(0H>2 and CoOOH... 

Tri-ethylene diamine Cobalt hydroxide [Co(en)3](OH)2 Cooxen Good solvating properties, extensive oxidative degradation, coloured (claret)... 

When the sulfide ore carroUite, CuS C02S3, is the starting material, first sulfides are separated by flotation with frothers. Various flotation processes are applied. The products are then treated with dilute sulfuric acid producing a solution known as copper-cobalt concentrate. This solution is then electrolyzed to remove copper. After the removal of copper, the solution is treated with calcium hydroxide to precipitate cobalt as hydroxide. Cobalt hydroxide is filtered out and separated from other impurities. Pure cobalt hydroxide then is dissolved in sulfuric acid and the solution is again electrolyzed. Electrolysis deposits metallic cobalt on the cathode. 

Tricobalt tetroxide is obtained when cobalt(ll) carbonate, cobalt(ll) or cobalt(III) oxide, or cobalt hydroxide oxide, CoO(OH) is heated in air at temperatures above 265°C. The temperature must not exceed 800°C (see decomposition temperature above). 

Cobalt Trifluoride, CoFs, mw 115.94 lt-brn, rree-tlowing pdr sp gr 3.88 reacts with w to form bk ppt of cobaltic hydroxide unstable in moist air. Can be prepd from Co ClFg (Ref 1)... 

Hexammino-cobaltic Hydroxide, or Luteo-cobaltic Hydroxide,... 

Hexammino-cobaltic Bromide, [Co(NH3)6]Br3, is obtained from the chloride by precipitating the solution with aqueous potassium bromide, or better, by saturating a solution of hexammino-cobaltic hydroxide with hydrogen bromide. The precipitate formed is recrystallised from water and obtained in glistening rhombic plates. 

Aquo-pentammino-cobaltic Hydroxide.—A hydroxide, possibly of formula [Co(XH3)5H20](OH)3, has been formed in solution either by the decomposition of the chloride, [Co(NH3)5H20]C13, of the series with moist silver oxide, or by the decomposition of a cold aqueous solution of the sulphate with barium hydroxide thus ... 

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