[Steenrod]

Consider the following reaction :

[tex]NO_2(g)+CO(g)\rightarrow CO_2(g)+NO(g)[/tex].

My text states that the rate of the reaction can be measured by measuring the change in the intensity of colour(of nitrogen dioxide) in the gaseous mixture in a given interval of time.

Question:How is that practically done in a laboratory?Thanks!

[Borek]

http://en.wikipedia.org/wiki/Spectrophotometry

http://en.wikipedia.org/wiki/Lambert_Beer_law

Do the reaction in the cuvette, or measure absorbance of the samples taken from the reacting mixture.