DO NOT do the questions in the lab handout.
Do these pre & post lab questions from the web page instead.

1. A dye solution allows 65.0% of the incident light to pass through.
What is the absorbance of this solution?

2. Another dye has an absorbance of 1.45 measured with a spectrophotometer. What is the percent transmittance of this solution?

3. If the concentration of the dye in question 2 above is reduced to 1/5th of its original concentration, what will the absorbance reading be now?

4. If a solution appears orange to the eye, what color light is absorbed and what is this color called? (i.e. the name of the color and what kind of color it is)

5. Why is it necessary to clean the outside of the sample tubes before placing them in the spectrophotometer?