The extinction coefficient for FD&C Blue Dye #1 is 138,500 cm-L/mol at 630 nm. A chemist collected the following data at 630 nm. She also found that the absorbance of an FD&C Blue Dye #1 solution of unknown concentration was 0.236. Use your graphing calculator to generate a standard curve from this data set, and use it to determine the concentration of the unknown solution. Express the answer in micromolar (notice micro means 106) Concentration of Blue Dye (M) Absorbance @ 630 nm 7.58x10-6 3.26x10-5 0.101 0.288 5.17x10-5 8.63x10-5 0.521 0.782

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