The flame tests for sodium and potassium are based on the emissions at 589 nm and 404

Chapter 7, Problem 7.93

(choose chapter or problem)

The flame tests for sodium and potassium are based on the emissions at 589 nm and 404 nm, respectively. When both elements are present, the Na1 emission is so strong that the K1 emission can be seen only by looking through a cobalt-glass filter. (a) What are the colors of these Na1 and K1 emissions? (b) What does the cobalt-glass filter do? (c) Why is KClO4 used as an oxidizing agent in fireworks rather than NaClO4?

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