![]() ![]() Why did the cobalt glass alter the color of the flame? Is cobalt chloride reaction endothermic or exothermic?Įndothermic The cobalt chloride solution is endothermic and the iron thiocyanate solution is exothermic. Since these are white, they contain all colors of the visible spectrum, not the characteristic line spectrum of cobalt. No color is imparted to the flame by cobalt(II) chloride, but a large number of incandescent flashes shoot out with the stream of burning gas. What color is cobalt chloride when burned?Ĭobalt(II) chloride imparts no color to a flame. As humidity increases, cobalt chloride changes color from sky blue to purple to pink. ![]() What turns cobalt chloride from blue to pink?Ĭobalt chloride, CoCl2, is a fascinating compound that changes color in response to humidity. 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. Adding concentrated hydrochloric acid to the solution changes the color of the solution to bluish-purple. Cobalt ions are hydrated in the solution and have a pink color. The cobalt chloride changes color because the salt in the solution dissociates into ions. As humidity increases, cobalt chloride gradually changes color from blue, to pink, to a lighter pink, almost white. What causes the cobalt chloride strip to change color?Ĭobalt chloride, CoCl 2, is an inorganic compound that changes color from blue to pink in response to humidity. Cobalt chloride hexahydrate is pink in color and cobalt chloride is blue in color. The cobalt chloride hexahydrate decomposes on heating to form cobalt chloride and water. What happens to cobalt chloride when heated? ![]()
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