Some Uses of UV VIS Spectroscopy

Predict from Table 14.7 the two colors that when mixed together produce green. 

UVA is spectroscopy is not nearly as useful as other instrumental techniques for determining the structures of organic compounds. However, UV/Vis spectroscopy has many other important uses. 

UVA is spectroscopy is often used to measure reaction rates. The rate of any reaction can be measured, as long as one of the reactants or one of the products absorbs UV or visible hght at a wavelength at which the other reactants and products have little or no absorbance. 

Lycopene, /3-carotene, and antho-cyanins are found in the leaves of trees, but their characteristic colors are usually obscured by the green color of chlorophyll. Chlorophyll is an unstable molecule, so plants must continually synthesize it. Its synthesis requires sunlight and warm temperatures. As the weather becomes colder in the fall, plants can no longer replace chlorophyll as it degrades, so the other colors become apparent. 

The rate at which a proton is removed from nitroethane is determined by monitoring the increase in absorbance at 240 nm. 

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