12/9/2023 0 Comments Cobalt chloride colorYes, they are put in with various consumer products, like electrical goods, shoes and handbags, to absorb water, because silica gel can absorb up to about 40% of its weight in water. Silica gel? You mean the stuff that comes in little bags with a warning not to eat them? It can be used as a humidity indicator in weather-measuring instruments, as well as in self-indicating silica gel. You can get an indicator paper – like litmus paper but containing cobalt chloride - which changes colour from blue to pink in the presence of water. This can again be reversed by adding water. If you warm pink CoCl 2.6H 2O gently – up to 150☌ or so - it will gradually lose water forming the violet CoCl 2.2H 2O, then blue anhydrous CoCl 2. You can reverse these changes with solid cobalt chloride crystals. First the purple dihydrate, CoCl 2.2H 2O, forms and then at higher humidity the pink hexahydrate CoCl 2.6H 2O is the product. ![]() Anhydrous cobalt chloride, CoCl 2, is blue in colour. It is an unusual material in the way it changes colour, particularly in the presence of water. Why be interested in cobalt chloride anyway? You can also obtain isolated CoCl 2 molecules in matrices of argon and nitrogen at low temperatures too (the unreactive Ar atoms and N 2 molecules come between CoCl 2 molecules, ‘spacing them out’). ![]() Electron diffraction measurements show that it is a linear molecule with Co-Cl distance of 2.113 Å. True, but this picture shows the structure of an isolated CoCl 2 molecule in the gas phase at around 1000 K. ![]() Why? Everyone knows that a metal and a non-metal form ionic bonds and have giant structures. COBALT CHLORIDE - Molecule of the Month June 2016 - HTML-only versionĬOBALT CHLORIDE A drug used to dope racehorses that's also a water indicator.
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