![]() 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.Dissolve 5 g of hydrated cobalt(II) chloride in 100 cm 3 of water (solution is TOXIC).The indicator papers should be handled as little as possible and hands washed after use. 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. Therefore, in accordance with Le Chatelier’s principle, when the temperature is raised, the position of the equilibrium will move to the right, forming more of the blue complex ion at the expense of the pink species. This resource provides instructions for preparing your own cobalt chloride indicator papers. (aq) CoCl (aq) + 6H O (l) is endothermic. RSC Yusuf Hamied Inspirational Science Programme Cobalt dichloride, Cobalt muriate, Cobaltous chloride, Dichlorocobalt Linear Formula: CoCl2 CAS Number: Molecular Weight: 129.84 EC Number: 231-589-4 MDL number: MFCD00010938 PubChem Substance ID: 329752407 NACRES: NA.55 Pricing and availability is not currently available.Introductory maths for higher education.The physics of restoration and conservation.Humidity indicators are used to quickly detect moisture and humidity levels in packaging (inc. ![]() Cobalt dichloride is a chemical regulated under European Chemical Bureau (ECB) REACH and has been identified as a substance of concern for the environment and for that reason Cobalt Dichloride Free HIC’s provide electronic and semiconductor manufacturers with an IPC/JEDEC J-STD-0.33 compliant humidity card that is free of Cobalt Dichloride and complies with evolving EU and WEEE directives regarding hazardous substances. ![]() Cobalt Dichloride FreeĬobalt dichloride is a chemical that changes colour when exposed to changing storage levels of moisture and is commonly used in HIC’s for that purpose. Cartons have a batch number for QA traceability. xCo Cobalt carbonate ( CoCO3 ) 513-79-1 A451-6297 CH2O3.Co Cobalt carbonyl ( Co2 ( CO ) 8 ) 1 A451-6314 C8C0208 Cobalt chloride. Our Standard Humidity Indicator Cards and Cobalt Dichloride Free Humidity Indicator Cards are available in three spot, four spot and six spot. Humidity Indicator Cards generally range from one spot to six spot cards. Hazard classification & labelling Hazard classification and labelling The ‘Hazard classification and labelling’ section shows the hazards of a substance based on the standardised system of statements and pictograms established under the CLP (Classification Labelling and Packaging) Regulation. The indicator spots on the HICs change colour from blue to pink as humidity increases and from pink to blue as humidity decreases. The cards are reversible and change as conditions change in the packing environment, allowing users to monitor the conditions of product packaging. In order to constantly verify that dry packaging methods are not compromised during storage and transport of products, Humidity Indicator Cards allow users along the supply chain to monitor the packages conditions. This indicates that the barrier bag and the desiccants have functioned correctly. When the bag is opened, the card can be examined for proper dryness inside the bag. The humidity inside dry packed moisture barrier bags can be monitored by including a humidity indicator card inside. Each Humidity Indicator Card is printed with moisture sensitive spots, which respond to various levels of humidity with a visible colour change from blue to pink. They are a low-cost method of indicating humidity conditions inside a moisture barrier bag after vacuum packing. Standard Cobalt Dichloride Free Humidity Indicator Cards (HIC’s) are used to determine when products have been exposed to moisture and humidity above recommended storage levels.
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