When ionic salts are placed into a flame, different wavelengths (colors) of light are produced. Let’s take a deep dive into why this happens, and what practical uses it uncovers.
First, let’s look at what is causing the color change. In the video player below, look at the name of the two compounds and the flame color produced. Use these to answer the questions below.
In each video, a salt is placed into the flame and heated. We then place a diffraction grating in front of the camera to separate the wavelengths (colors) of light. Only a small sliver of light is allowed through to add definition to the wavelength lines. The slit is important when we start measuring the wavelength in the next section.
Compare the two compounds. Which is different between the two compounds: the metal cation or the halogen anion?
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