Blue cobalt chloride paper turns pink7/23/2023 This means that different wavelengths of light are either muted or amplified, thereby changing the color of the steel. The hotter the steel gets, the thicker this oxide layer becomes. When two or more substances combine, they create one or more new substances, which sometimes have different molecular structures from the original substances, meaning they absorb and radiate light in different ways, leading to a color change. What paper turns from blue to pink?Ĭobalt chloride paper Cobalt chloride paper remains blue on the upper surface of the leaf but turns pink on the lower surface of the leaf. 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. Cooling will shift the products towards the hydrated complex, which is more pink. If heat is added, the equilibrium will shift towards the cobalt chloride complex, which is blue in color. Why does cobalt chloride change color when heated?Ī change in temperature or concentration of the ions will shift the equilibrium. 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. The change in colour indicates that water is released on the undersurface of the leaf, which turns the paper moist. We know that the cobalt chloride turns from blue to pink under moist conditions. The colour change happens because the dried paper gets moistened by the water droplets released during transpiration. Why the cobalt chloride paper changed its colour from blue to pink?
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