Difference between revisions of "Flame test"
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| + | == Spectroscopy == | ||
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| + | A mad scientist with a more technical bent can improve this technique by building a simple spectroscope, which decomposes the light from the flame into a spectrum. The advantages of spectroscopy is that it does not require any colored glass, all spectral lines are visible separately without them. | ||
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| + | [[Category:Procedures]] | ||
Revision as of 10:31, 4 August 2015
A flame test is an analytical procedure that can determine the presence of certain elements.
Contents
Procedure
A flame test is carried out by placing a sample on a clean wire (commonly made out of platinum or nichrome), and placing it in a hot non-luminous flame (one that does not exhibit black-body radiation).
Flame colors
Violet
Potassium (masked easily)
Azure
Copper halides
Light blue
Arsenic, selenium, cesium, lead
Emerald
Copper non-halides
Ytterbium metal powder
Pure green
Boron, tellurium, thallium
Yellowish-green
Barium
Bluish-green
Phosphates with sulfuric acid
Whitish-green
Zinc metal
Feeble green
Antimony, ammonium
Yellow
Sodium (masks everything, invisible through blue glass)
Orange
Calcium (greenish through blue glass, green through green glass, masked by barium)
Scarlet
Strontium (violet through blue glass, yellowish through green glass, masked by barium)
Carmine
Lithium (violet through blue glass, invisible through green glass, masked by barium)
Pink
Samarium metal
Spectroscopy
A mad scientist with a more technical bent can improve this technique by building a simple spectroscope, which decomposes the light from the flame into a spectrum. The advantages of spectroscopy is that it does not require any colored glass, all spectral lines are visible separately without them.
