Cobalt , hexahydrate

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... 

Cobalt(II) chloride hexahydrate [7791-13-1], C0CI2 6H20 is a deep red monoclinic crystalline material that deflquesces. It is prepared by reaction of hydrochloric acid with the metal, simple oxide, mixed valence oxides, carbonate, or hydroxide. A high purity cobalt chloride has also been prepared electrolyticaHy (4). The chloride is very soluble in water and alcohols. The dehydration of the hexahydrate occurs stepwise ... 

Cobalt(II) nitrate hexahydrate [10026-22-9], Co(N02)2 6H20, is a dark reddish to reddish brown, monoclinic crystalline material containing about 20% cobalt. It has a high solubiUty in water and solutions containing 14 or 15% cobalt are commonly used in commerce. Cobalt nitrate can be prepared by dissolution of the simple oxide or carbonate in nitric acid, but more often it is produced by direct oxidation of the metal with nitric acid. Dissolution of cobalt(III) and mixed valence oxides in nitric acid occurs in the presence of formic acid (5). The ttihydrate forms at 55°C from a melt of the hexahydrate. The nitrate is used in electronics as an additive in nickel—ca dmium batteries (qv), in ceramics (qv), and in the production of vitamin B 2 [68-19-9] (see Vitamins, VITAMIN B22)-... 

Chemical Designations - Synonyms Cobalt (II) Chloride Cobaltous Chloride Cobaltous Chloride Dihydrate Cobaltous Chloride Hexahydrate Chemical Formula CoClj,... 

Write the formulas of (a) cobalt(II) chloride hexahydrate (b) diboron trisulfide. STRATEGY... 

In view of the ready commercial availability and apparent stability of the hexahy-drate, it is probable that the earlier report of explosion on impact, and deflagration on rapid heating [1] referred to the material produced by partial dehydration at 100°C, rather than the hexahydrate [2], The caked crystalline hydrated salt, prepared from aqueous perchloric acid and excess cobalt carbonate with subsequent heated evaporation, exploded violently when placed in a mortar and tapped gently to break up the crystalline mass, when a nearby dish of the salt also exploded [3]. Subsequent investigation revealed the probable cause as heating the solid stable hexahydrate to a temperature ( 150°C) at which partial loss of water produced a lower and endothermic hydrate (possibly a trihydrate) capable of explosive decomposition. This hazard may also exist for other hydrated metal perchlorates, and general caution is urged [4,5],... 

Cobalt nitrate hexahydrate (97%) and D-mannitol (99%) were obtained from Alfa Aesar and used as received. Alumina HP14-150 is a gamma alumina with surface area around 150 m2 g which was supplied by Sasol and used as received. 

The unmodified catalyst was prepared by dissolving cobalt nitrate hexahydrate (19.76g, 68 mmol) in water (9 ml) and impregnating the solution into alumina (16.0 g). The catalyst was dried at 105°C in static air for 3 h and calcined at 400°C for 1 h. The mannitol-containing catalyst was prepared as described above, except that mannitol (2 g, 11 mmol) was dissolved in the cobalt nitrate solution prior to impregnation. The Co/mannitol ratio was 6.2. 

Visible spectroscopy (Figure 1.7) shows that mannitol does not form a complex with cobalt nitrate hexahydrate in water, even when heated to reflux. This... 

Prior to functionalization the carbon nanomaterials were washed in concentrated nitric acid (65% Fisher Scientific) for 8 h using a Soxhlet device in order to remove catalyst residues of the nanomaterial synthesis as well as to create anchor sites (surface oxides) for the Co on the surface of the nanomaterials. After acid treatment the feedstock was treated overnight with a sodium hydrogen carbonate solution (Gruessing) for neutralization reasons. For the functionalization of the support media with cobalt particles, a wet impregnation technique was applied. For this purpose 10 g of the respective nanomaterial and 10 g of cobalt(II)-nitrate hexahydrate (Co(N03)2-6 H20, Fluka) were suspended in ethanol (11) and stirred for 24 h. Thereafter, the suspension was filtered via a water jet pump and finally entirely dried using a high-vacuum pump (5 mbar). 

Cobalt difluoride, 7 231-232 Cobalt dilanthanum tetroxide, uses, 7 24 It Cobalt driers, 9 147-148 CobaltCII) ethylhexanoate, 7 230 Cobalt extraction, 10 791 Cobalt fluoroborate hexahydrate, 4 157t, 158, 159... 

CobaltCII) sulfate, uses, 7 24 It CobaltCII) sulfate heptahydrate, 7 231 Cobalt sulfate hexahydrate, analysis, 7 237t... 

Capperucd and co-workers investigated the dimerization of a,/i-un saturated thioacylsilanes 224, which are generated in situ from 1-silylated alkoxyallenes 222 using bis(trimethylsilyl) sulfide and cobalt(II) chloride hexahydrate as reagents. The resulting 1,2-thiins 223 are isolated as major products in 29-65% yield [128] (Scheme 8.55). 

Formula CoCOs MW 118.94 also forms a hexahydrate, CoC03 6H20 Synonym cobaltous carbonate... 

The solution on concentration and cooling forms crystals of hexahydrate which on heating with SOCI2 dehydrates to anhydrous cobalt(II) chloride. Alternatively, the hexahydrate may be converted to anhydrous C0CI2 by dehydration in a stream of hydrogen chloride and dried in vacuum at 100-150°C. The anhydrous compound also may be obtained by passing chlorine over cobalt powder. 

Formula C0I2 MW 312.74 also forms a hexahydrate, Col2 6H20, MW 420.83 Synonyms cobaltous iodide cobalt diiodide... 

The hexahydrate is red monoclinic crystal deliquescent in moist air density 1.87 g/cm3 decomposes at 55°C, losing three molecules of water decomposes to green cobalt(II) oxide on further heating at 74°C very soluble in water (134 g/lOOmL at 0°C) also soluble in alcohols and acetone. 

Cobalt(II) nitrate is prepared by treating the metal, or its oxide, hydroxide or carbonate with dilute nitric acid. The solution on evaporation yields red crystals of hexahydrate ... 

The anhydrous salt of cobalt(II) suhate is a red orthogonal crystal density 3.71g/cm3 melts above 700°C the monohydrate is red orthogonal crystal having a density of 3.08 g/cm the heptahydrate is a pink salt, monoclinic prismatic crystals, density 2.03 g/cm heptahydrate dehydrates to hexahydrate at 41°C and converts to monohydrate at 74°C the anhydrous salt and heptahy-drates are soluble in water monohydrate slowly dissolves in boiling water. 

The hexahydrate forms emerald green monochnic crystals hygroscopic density 2.05 g/cm isomorphous with corresponding cobalt salt melts at 56.7°C loses water on heating, decomposing to nickel oxide very soluble in water aqueous solution acidic soluble in ethanol. 

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