![]() ![]() ![]() Hydrochloric acid works the best, but sodium chloride can be used too. The green form is cobalt chloride reacted with a lot of hydrochloric acid.Ī different blue form is made when cobalt(II) chloride is reacted with a chemical compound that has chloride in it. The blue form is the color that it gives with some hydrochloric acid. The blue form will absorb water from the air and turn red again.Ĭobalt(II) chloride reacted with hydrochloric acid. It can be heated to turn it into the blue form, without water. It contains cobalt and chloride ions.Ĭobalt(II) chloride is normally found in the red (or pink) form. It contains cobalt in its +2 oxidation state. Some are stable and benign, some ignite when exposed to air, and one of them is so dangerous that it killed a chemist who spilled a tiny amount on the back of her glove.Except where otherwise noted, data are given for materials in their standard state (at 25 ☌, 100 kPa).Ĭobalt(II) chloride hexahydrate (with six water molecules attached) Cobalt(II) chloride anhydrous (with no water molecules attached)Ĭobalt(II) chloride, also known as cobaltous chloride and cobalt dichloride, is a chemical compound. (1) Organometallic chemicals contain at least one covalent bond between a carbon atom and a metal. The general advice seems to be "take just enough but not too much," which isn't too different from dosing advice for all vitamins and drugs. What about people who are B 12 deficient but also allergic to cobalt? They cannot avoid the cobalt since it is part of the vitamin. So, people who are allergic to B 12 are actually reacting to the presence of cobalt, which is similar in properties to nickel - a known allergen. Furthermore, allergy to multiple metals and metal alloys has been demonstrated. Source: Nritya Creations (Right) Cobalt and nickel are neighbors on the periodic table. (Left) A skin patch test showing allergies to both cobalt and nickel. ![]() Once you develop a nickel allergy, however, you'll always be sensitive to the metal and need to avoid contact."įigure 3. ![]() Treatments can reduce the symptoms of nickel allergy. It may take repeated or prolonged exposure to items containing nickel to develop a nickel allergy. "Nickel allergy is a common cause of allergic contact dermatitis - an itchy rash that appears where your skin touches a usually harmless substance. This shouldn't be too surprising since nickel happens to be a known skin allergen and a cause of eczema and contact dermatitis. And nickel just happens to reside right next to cobalt on the periodic table. Perhaps the nickel reaction is even more pronounced than that from cobalt. Figure 3 shows a cobalt skin patch test that also includes nickel. Why would anyone be allergic to cobalt? Chemistry gives us an answer. A cobalt allergy can be confirmed by a skin patch test (Figure 2).įigure 2. Vitamin B 12 is essential for every cell in the human body (animals too), so it may seem strange, but some people are allergic to it and they can suffer either an acute or chronic itchy rash that can have small blisters containing a clear fluid, skin that is red, swollen, oozing, or peeling. This motif is nature's way of binding organic metals to metals. Note that in all three molecules metal ions are coordinated - held in the middle - of four nitrogen atoms (yellow stars) which are part of five-membered rings. (Right) Partial structure of chlorophyll (Magnesium is in the green circle). (Center) Heme, the "business end" of hemoglobin (Iron is in the red circle). (Cobalt is in the blue circle, cyanide in the red circle). Biologically important metal coordination complexes: (Left) Cyanocobalamin, one of the forms of Vitamin B 12. Although cobalt-containing biomolecules are rare in nature, cyanocobalamin is structurally very similar to two other common organometallic (1) molecules, heme, and chlorophyll (Figure 1).įigure 1. Despite one molecule of cyanide there isn't a whole lot to be scared about Vitamin B 12, but in rare circumstances, it is this:Ĭyano COBALamine (COBAL being short for the metal cobalt). If there is anything scary sounding about any of them, most people would pick:īut they'd be wrong. Consider three names for the chemical below. Contrary to what the Food Babe says, the spelling, length, or pronunciation of a chemical has absolutely nothing to do with its health properties, good, bad, or neither. ![]()
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