![]() Special Hazards of Combustion Products: Toxic cobalt oxide fumes may form in fire. Contact causes irritation of eyes and may cause skin rash. Ingestion causes pain, vomiting, and diarrhea. Inhalation causes respiratory disease, shortness of breath, and coughing permanent disability may occur. Potassium or sodium metals act to reduce metal halides, producing exothermic reactions, even explosions. Many of these compounds catalyze organic reactions. They usually do not react as either oxidizing agents or reducing agents but such behavior is not impossible. These neutralizations generate heat, but less or far less than is generated by neutralization of inorganic acids, inorganic oxoacids, and carboxylic acid. The resulting solutions contain moderate concentrations of hydrogen ions and have pH's of less than 7.0. Cobalt chloride acts as a weakly acidic inorganic salt, which is soluble in water. Reactivity ProfileĪ 0.2 molar aqueous solution has a pH of 4.6. Cobalt(II) chloride participates in the synthesis of various esters in the presence of acetonitrile. General DescriptionĬobalt(II) chloride is an anhydrous cobalt salt. It is used as an indicator for water in desiccants. DefinitionĬhEBI: A cobalt salt in which the cobalt metal is in the +2 oxidation state and the counter-anion is chloride. ![]() Cobalt(II) chloride catalyzes cross coupling of aryl halides or vinyl halides with aryl grignard reagents in excellent yields. Cobalt chloride is useful for producing invisible ink as it turns blue when heated and becomes invisible once it gets cooled. Cobalt chloride is an indicator for water in desiccants, owing to the reversible hydration/dehydration coupled with distinct color change. In the anhydrous form, it finds use in electroplating of cobalt, in organic chemistry and is a precursor to cobaltocene, (bis(cyclopentadienyl)cobalt(II), which is a good reducing agent. UsesĬobalt(II) chloride is used in humidity indicator in weather instruments. Solid lubricant, dye mordant, catalyst, barometers, UsesĪbsorbent for ammonia, gas masks, electroplating, sympathetic inks, hygrometers, manufacture of vitamin B It is also of use in manufacturing solid lubricants, as anĪdditive to fertilizers, as a chemical reagent in laboratories, and as an absorbent in gas masks,Įlectroplating, and the manufacture of vitamin B12. It is also used as a dye mordant (to fix the dye to Itself can cause damage to red blood cells. ![]() ![]() UsesĬobalt chloride (CoCl2) is used to manufacture vitamin B12, even though the compound Physical propertiesīlue leaflets turns pink in moist air hygroscopic the dihydrate is violet blue crystal the hexahydrate is pink monoclinic crystal density 3.36, 2.48 and 1.92 g/cm3 for anhydrous salt, dihydrate and hexahydrate, respectively anhydrous salt melts at 740☌ and vaporizes at 1,049☌ vapor pressure 60 torr at 801☌ the hexahydrate decomposes at 87☌ the anhydrous salt and the hydrates are all soluble in water, ethanol, acetone, and ether the solubility of hydrates in water is greater than the anhydrous salt. (1) Blue, (2) ruby-red crystals.Soluble in water, alcohol, and acetone. Pale blue leaflets, turns pink upon exposure to moist air. The anhydrous compound also may be obtained by passing chlorine over cobalt powder. The solution on concentration and cooling forms crystals of hexahydrate which on heating with SOCl2 dehydrates to anhydrous cobalt(II) chloride.Īlternatively, the hexahydrate may be converted to anhydrous CoCl2 by dehydration in a stream of hydrogen chloride and dried in vacuum at 100–150☌. The vapor-phase co-reductions with other metal halides by hydrogen results in finely divided intermetallics with applications as structural materials or compounds with useful thermoelectric, magnetic, and oxidation-resistance properties.Ĭobalt(II) chloride is prepared by the action of cobalt metal or its oxide, hydroxide, or carbonate with hydrochloric acid: It also is used to prepare several other cobalt salts and in the manufacture of synthetic vitamin B12. Humidity indicator as a temperature indicator in grinding as a foam stabilizer in beer in invisible ink for painting on glass in electroplating and a catalyst in Grignard reactions, promoting coupling with an organic halide. Cobalt(II) chloride has several applications.
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