Cobalt chloride paper test free#

How does the structure change as water molecules are added?Īnhydrous CoCl 2 has the same structure as cadmium chloride, CdCl 2. Silica gel is sometimes supplied containing some cobalt chloride, which indicates the water content – blue when it is dry, pale pink when the air round it is damp. When you heat the gel, it loses the water so you can reuse it. Yes, 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. Select a product to see it's specifcation.COBALT CHLORIDE - Molecule of the Month June 2016 - HTML-only versionĬOBALT CHLORIDE A drug used to dope racehorses that's also a water indicator.

Cobalt chloride paper test free#

Moisture Indicator Paper undergoes a distinctive colour change from yellow/green to colourless and is free from toxic substances and carcinogens.

Individuals who are exposed to this paper while handling or packing can be exposed to it’s toxic effects and a health and safety risk assessment should be carried out before use. The cobalt chloride free Moisture Indicator Paper is a safer alternative to the incumbent Humidity Indicator Paper which contain cobalt chloride (CoCl2) - now known to be carcinogenic and toxic. Moisture Indicator Paper (Cobalt chloride free) The final colour change of the test determines the relative humidity of the atmosphere in question. Relative atmospheric humidity can be quickly and easily ascertained with this test. electronics and optical systems are operational and if the goods are being protected from humidity. Humidity Indicator paper can be used to check dessicants packaged and sealed with humidity sensitive goods e.g. Wet-strengthened Qualitative Filter Papers.