ANDREW MCCLENAGHAN / SCIENCE PHOTO LIBRARY. ANDREW MCCLENAGHAN / SCIENCE PHOTO LIBRARY.
Sodium metal flame test: a clean nichrome wire is dipped into a salt solution containing the metal (eg sodium chloride in this case) and the wire introduced into the bunsen flame, which glows with a characteristic yellow flame. Colour is due to the fact that the metal salt is vapourised by the flame and excited to emit radiations that are characteristic for that metal. The same phenomenon provides the basis for flame photometry, where intensity of emission indicates concentration of a particular metal in solution.
Model release not required. Property release not required.