Potassium carbonate is primarily used as a flux in glass production. The purpose is to observe the characteristic colors produced by certain metallic ions when vaporized in a flame and then to identify an unknown metallic ion by means of its flame test. Within the flame, regions of particles with similar energy transitions will create a seemingly continuous band of color. The color of light emitted depends on the energy emitted by each electron returning to its original state. What is responsible for the colors during a flame test? Using blue cobalt glass will absorb the yellow color and the other substances in the flame can be seen. What is the purpose of observing some of the tests through cobalt glass? In flame tests, sodium ions may contaminate a sample and produce a yellow flame, masking the colors of the other ions. How does the cobalt glass aid in the identification of certain ions? 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. Royal blue, by contrast, is a deep blue that often has a strong reddish tinge, and therefore leans more purple than cobalt blue. It is named after pigments that contain an oxide of the element cobalt. What is the difference between blue and cobalt blue?Ĭobalt blue ranges from a deep blue to a strong blue-green color. On exposure to the water or the water vapours, the cobalt chloride absorbs the water molecule. As the humidity increases the cobalt chloride changes the colour from sky blue to the purple and then to the pink. Why does cobalt change from blue to pink?Ĭobalt chloride changes the colour in response to the humidity. The idea behind blue-light-blocking glasses is that wearing them can reduce eyestrain, eye damage, and affected sleep. Cobalt compounds have been used for centuries to create a rich blue color in glass, glazes, ceramics, porcelain, pottery, tiles, and enamels. What color does cobalt burn?Ĭobalt is commonly used in electroplating because of its appearance, hardness, and resistance to oxidation. It only requires a small amount of cobalt oxide to produce a deep rich blue. Copper is a more delicate colorant than cobalt. Most blue glass is given its color either from cobalt oxide or from copper oxide added to the molten glass. It is made by incorporating cobalt oxide in the molten glass mixture. 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 change color when heated?Ī change in temperature or concentration of the ions will shift the equilibrium. Purple-Red Purple-Red: Potassium in the presence of sodium when viewed through cobalt blue glass. What color does potassium burn through cobalt glass? In the flame test, sodium emits intense yellow color, but when we see it through cobalt blue glass, the yellow gets filter out and we notice the lavender emission. Will you see the color of the flame of sodium through cobalt glass? And the potassium flame may be dim, but it is visible. Seen through a cobalt glass, the sodium flame color is invisible (entirely absorbed). What is the purpose of cobalt blue glass Why is only the purple colour of the potassium seen through the cobalt glass?Ĭobalt glass is used for removing the intense yellow lines of sodium that is present everywhere in small amount, and which prevents to see the color of potassium flames. What does cobalt do in glass?Ĭobalt oxide additions of 140 to 4,500 grams (5 ounces to 10 pounds) per ton of glass are made to impart a blue colour to structural glass, bottles, and optical filter glasses. Using the cobalt glass allows you to see the “underlying” color by filtering out the dominant color as the potassium burns. The potassium ion (K+) releases two colors of light. What is the reasons for using cobalt glass to observe the flame of potassium?
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