#4 Illinois Central CollegeCHEMISTRY 130PRELAB: Exp.11 Beer's LawName:SHOW YOUR WORKExercise 11 Page 91. A substance that absorbs light at 495 nm appears to have what color? (refer to Table 1.)2. Referring to the colorimeter in this experiment, if a sample transmits sufficient light to cause a currentof 488 microamperes in the photocell compared to a blank solution that allows a current of 622microamperes, what is the %Transmittance of the solution?3. What would the Absorbance value be for the solution in problem #2?4. Why does the procedure for measuring the concentration of a solution photometrically requirethe use of a "blank"?

#4: A blank solution is usually the solvent and other reagents used to dilute the analyte and…

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4. Why does the procedure for measuring the concentration of a solution photometrically require the use of a "blank"?

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Spectroanalytical Methods

Spectroanalytical methods measure the wavelength and intensity of radiations that are either emitted or absorbed by a molecular or atomic species. These methods are useful for evaluating the electronic or atomic arrangement of the molecules of a given analyte.

Question

Illinois Central College
CHEMISTRY 130
PRELAB: Exp.11 Beer's Law
Name:
SHOW YOUR WORK
Exercise 11 Page 9
1. A substance that absorbs light at 495 nm appears to have what color? (refer to Table 1.)
2. Referring to the colorimeter in this experiment, if a sample transmits sufficient light to cause a current
of 488 microamperes in the photocell compared to a blank solution that allows a current of 622
microamperes, what is the %Transmittance of the solution?
3. What would the Absorbance value be for the solution in problem #2?
4. Why does the procedure for measuring the concentration of a solution photometrically require
the use of a "blank"?

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