o b s e r v a t i o ns Add the metallic ion to a flame and the color of the flam

Question

observations                                                                                                  

Add the metallic ion to a flame and the color of the flame is expected to be as follows:

Metallic ion                Flame color

Sodium Na+

Strontium Sr2+

Potassium K+

Lead Pb2+

Barium Ba2+

Copper Cu2+

Lithium Li+

Calcium Ca2+

Questions                                                                                                  

A. All chemical used in this test are binary compounds. What portion of the periodic table is responsible for the color observed?

B. In cooking over an open flame, a yellow flame is often observed when some food is spilled into the flame? What is most likely responsible for the yellow flame color?

C. What problems might be associated with using flame color for identification purposes?

D. Explain how the observed colors are produced

Explanation / Answer

1.mostly metal cations responsible for characteristic colors

2.yellow flame is due to sodium in food

3.Different substances can produce similar results in color. This can cause uncertainty with identifying the substance.

4.colors are due to d-d transition of electrons

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