This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: 6. Absorbance is preferred to %transmittance in spectroscopy, because absorbance is necessary to create a linear relationship. Absorbance= 2-log%transmittance. According to Beers law there is linear relationship between absorbance and concentration. As concentration increases, absorbance increases, and transmittance decreases. 7. The longer wavelength LED was used contrary to a shorter wavelength because this long low energy wave promoted greater absorbance in relation to shorter wavelength. Sheldon Pope Individual portion 12-5-07 8. The disadvantage of using a colorimeter is the precision factor; a spec 20 would be much more precise. The other disadvantage is a spec 20 calculates everything in the machine by itself. A spectrophotometer also can use wavelengths every twenty nanometers. This means the exact wavelength where the most absorbance of color can be found....
View Full Document
This note was uploaded on 04/18/2008 for the course CHEM 403 taught by Professor Bauer during the Spring '08 term at New Hampshire.
- Spring '08