If, for instance, a sodium flame be “urged,” by increasing the intensity of the flame and the quantity of metallic vapour present, each of the two D-lines becomes double, as is well known ...

When isolated in metallic form, silvery white sodium is a violent element, immediately oxidising upon contact with air, and violently producing hydrogen gas which may burst into flame when brought ...

The sodium reacts most vigorously with the nitric acid, producing a flame and smoke. The sodium also reacts pretty strongly with the weaker concentration of hydrochloric acid. The demonstration shown ...

Compared to simple laboratory tests, instrumental methods of analysis may give improved: A solution containing sodium ions gives a reading of four units on the flame photometer. Use the ...