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Q & A: Why are there different colors in Bunsen burner flames?

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Most recent answer: 07/06/2014
Q:
why does the orange colored flame from a bunsen burner turns bluish when air is admitted and why isn't there a black smoke emitted while the orange flame has?
- blesmee (age 16)
san fernando city, la union, philippines
A:

  Hello Blesmee,

It is mainly due to different ratios of oxygen to the combustable gas.  An excellent source of information on the subject can be found at .   The following picture and explanation is taken from this article:

                              

Different flame types of a depend on oxygen supply. On the left a rich fuel with no premixed oxygen produces a yellow sooty diffusion flame; on the right a lean fully oxygen premixed flame produces no soot and the flame color is produced by molecular radicals, especially CH and C2 .

 

LeeH


(published on 07/06/2014)

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