Pre-lab: Concentration of Riboflavin 1. The following absorbance spectrum is recorded for a dye. Which is the most likely color of this dye? a. Blue-green b. Colorless c. Red d. Black M stock solution is diluted to 10.00 ml, what is the final 2. If 4.00 mL of a 5.00 x 10 concentration? 3. The absorbance of known concentrations of red food dye were measured in order to generate the following calibration curve. 2. Annotate the graph with the labels and units of the x and y axes. Also add an appropriate title. b. Imagine a red food dye solution of unknown concentration was found to have an absorbance of 0.80. Using the calibration curve, estimate the concentration of the unknown dye solution. ES E-2 193