Water indicator, especially in desiccantsĬobalt dichloride is a strong allergen, with a LD 50 of 80 mg/kg (rats).Įye and hand protection should be worn while handling this compound.Ĭobalt(II) chloride should be stored in an airtight container or bag to counter its strong hygroscopic nature.Ĭobalt dichloride should be converted to an insoluble form before disposal.Cobalt chloride can be used for the synthesis of many complexes, such as Hexamminecobalt (III) chloride and Potassium cobaltinitrite. Cobalt Dichloride is classified, according to the 25th ATP, updated in the 29th ATP of Annex I of Directive 67/548/EEC as: Carc.It can also be found in some types of colored silica gel, though the amount is small.Ĭobalt(II) chloride, along with other cobalt(II) compounds is classified as "Substance of very high concern" in the EU and its sale is regulated. If heptahydrate crystals are desired the solution may be dried in a desiccator.Ĭobalt(II) chloride can be purchased from chemical suppliers, both as a solid and as a solution. Usually, there will be a layer of unreacted cobalt carbonate/other contaminants that must be filtered out using either vacuum or gravity filtration in order to receive a pure product.īy heating this solution to dryness a light blue powder will be formed which is anhydrous cobalt chloride. Add a small amount of acid and then stir the mixture before adding another small portion, as the CO2 created can cause the mixture to overflow. The density for the three forms is 3.356 g/cm 3 (anhydrous), 2.477 g/cm 3 (dihydrate), 1.924 g/cm 3 (heptahydrate).Ĭobalt chloride heptahydrate can be synthesized by reacting two moles of hydrochloric acid with one mole of cobalt carbonate. CoCl 2 is soluble in water (52.9 g/100 mL at 20 ☌) methanol (38.5 g/100 mL), and slightly soluble in acetone, diethyl ether. The name comes from the German word ‘Kobold’ meaning goblin or elf. It is also called cobalt dichloride hexahydrate, cobalt blue, cobaltous chloride hexahydrate, and cobalt hexahydrate. The compound melts at 735 ☌ (anhydrous), 100 ☌ (dihydrate), 86 ☌ (hexahydrate). Cobalt is one of the most common metals to cause contact allergy via a delayed hypersensitivity reaction. They are not toxic like lead or mercury compounds, though.Cobalt(II) chloride is a salt that is blue when anhydrous and pink-purple when hydrated. Cobalt compounds are toxic in large quantities, like any other transition metal compounds. It is a weak oxidizing agent, too weak to ignite things. It is the most common cobalt compound in the lab. Synonym (s): Cobalt dichloride, Cobalt muriate, Cobaltous chloride, Dichlorocobalt. It can be used to make other cobalt compounds. AnhydroBeads, 10 mesh, 99.9 trace metals basis. It is used to place cobalt into other chemical compounds. The hydrated (with water) red form can be made by reacting cobalt(II) oxide or cobalt(II) hydroxide with hydrochloric acid. The anhydrous (without water) blue form can be made by reacting cobalt with chlorine. If it is made, it just drops a Cl from CoCl 3, making CoCl 2 (cobalt(II) chloride) again. It can be oxidized to cobalt(III) compounds, although cobalt(III) chloride does not exist. Cobalt chloride can be used to test for chloride ions in this way. When it is heated, it turns more blue than when it is cooled.įor an example. Hydrochloric acid works the best, but sodium chloride can be used too. The green form is cobalt chloride reacted with a lot of hydrochloric acid.Ī different blue form is made when cobalt(II) chloride is reacted with a chemical compound that has chloride in it. The blue form is the color that it gives with some hydrochloric acid. The blue form will absorb water from the air and turn red again.Ĭobalt(II) chloride reacted with hydrochloric acid. It can be heated to turn it into the blue form, without water. It contains cobalt and chloride ions.Ĭobalt(II) chloride is normally found in the red (or pink) form. It contains cobalt in its +2 oxidation state. Uses : cobalt chloride is used in surface treatment (cobalt or Nickel/Cobalt plating), as a corrosion inhibitor, for water treatment, in. Except where otherwise noted, data are given for materials in their standard state (at 25 ☌, 100 kPa).Ĭobalt(II) chloride hexahydrate (with six water molecules attached) Cobalt(II) chloride anhydrous (with no water molecules attached)Ĭobalt(II) chloride, also known as cobaltous chloride and cobalt dichloride, is a chemical compound.
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