The filter paper can be cut into small strips and stored in a desiccator with dry silica gel.Soak filter paper in this solution, drain and dry in an oven (set at no more that 100 ☌), so that it is a definite blue colour.As you can imagine this colour change due to the presence of water is. Cobalt can also colour glass green, while the hydrated form of cobalt chloride is a beautiful deep rose colour. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Dissolve 5 g of hydrated cobalt(II) chloride in 100 cm 3 of water (solution is TOXIC). Element Cobalt (Co), Group 9, Atomic Number 27, d-block, Mass 58.933.Cooling will shift the products towards the hydrated complex, which is more pink. The indicator papers should be handled as little as possible and hands washed after use. What happens to cobalt when heated If heat is added, the equilibrium will shift towards the cobalt chloride complex, which is blue in color. Cobalt chloride (TOXIC, DANGEROUS FOR THE ENVIRONMENT, may cause SENSITISATION) – see CLEAPSS Hazcard HC025 and CLEAPSS Recipe Book RB030. Read our standard health and safety guidance.Hexahydrate cobalt(II) chloride CoCl 2♶H 2O (TOXIC, DANGEROUS FOR THE ENVIRONMENT, SENSITISER ), 5 g.The hexahydrate is deep purple in color, whereas the anhydrous form is pale blue. Cobalt chloride paper is useful because the hydration/dehydration reaction occurs readily making the paper an indicator for water. It is usually supplied as the hexahydrate CoCl 2♶H 2O. You can use the papers to test for the presence of water, where the colour changes from blue to pink.Ĭobalt(II) chloride is an inorganic compound of cobalt and chlorine, with the formula CoCl 2. This resource provides instructions for preparing your own cobalt chloride indicator papers.
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