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Cobalt ii chloride formula6/10/2023 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. How to Write the Formula for Cobalt (III) chloride Wayne Breslyn 638K subscribers 11K views 4 years ago In this video we'll write the correct formula for Cobalt (III) chloride, CoCl3.Cobalt chloride can be used for the synthesis of many complexes, such as Hexamminecobalt (III) chloride and Potassium cobaltinitrite.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. You can use the papers to test for the presence of water, where the colour changes from blue to pink. CoCl2.6H2OCoCl2+6H2O The reaction is reversed by adding water. 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. This resource provides instructions for preparing your own cobalt chloride indicator papers. Hydrated cobalt(II) chloride decomposes on heating. 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 compound melts at 735 ☌ (anhydrous), 100 ☌ (dihydrate), 86 ☌ (hexahydrate). Cobalt(II) chloride is a salt that is blue when anhydrous and pink-purple when hydrated.
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