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Acidic aqueous solutions containing dichromate and iodide ions are mixed with no reaction. The addition of a solution of iron(II) ion induces the rapid formation of brown triiodide ion.
No color is imparted to the flame by aluminum chloride. This indicates that neither aluminum nor chlorine has a characteristic flame color. A few tinges of yellow-orange sodium color appear as a consequence of traces of sodium impurity in the aluminum chloride solution.
A very pale green color is imparted to the flame by boron in boric acid. A few tinges of yellow-orange sodium color appear as a consequence of traces of sodium impurity in the boric acid solution. The intensity of the boron flame color can be increased by burning boron-containing samples in alcohol, but for consistency with the other tests, this was not done here.
A yellowish-red color is imparted to the flame by calcium chloride. The color is not as bright yellow as the sodium flame color.
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. Since these are white, they contain all colors of the visible spectrum, not the characteristic line spectrum of cobalt.
A bright green color is imparted to the flame by copper(II) chloride. The color is so bright that in some cases it appears white. Usually copper salts other than the chloride are emerald green and copper chlorides are azure blue, but in this case the chloride appears emerald green.
A carmine-red color is imparted to the flame by lithium chloride. The color is less intense than the strontium flame color. A few tinges of yellow-orange sodium color appear as a consequence of traces of sodium impurity in the lithium chloride solution.
No color is imparted to the flame by magnesium chloride. This indicates that neither magnesium nor chlorine has a characteristic flame color. A few tinges of yellow-orange sodium color appear as a consequence of traces of sodium impurity in the magnesium chloride solution.
A pale yellow-green color is imparted to the flame by manganese(II) chloride, but a large number of incandescent flashes shoot out with the stream of burning gas. Since these are white, they contain all colors of the visible spectrum, not the characteristic line spectrum of manganese.
A bright yellow-orange color is imparted to the flame by sodium chloride.