Question

Red Food Coloring Absorption Spectrum 1.000 0.800 0 600 0.400 0 200 400 450 500 Sso 600 650 3a. If the molar absorptivity constant at the optimum wavelength for the red dye solution is 5.56x104 M-lcm1, calculate the molarity of the red dye solution based on the absorbance value you obtained in question #2. You may assume L-1.22cm. Hint: A-ELC Molar mass of FD&C #3 = 879.86 g/mol b. Convert the molarity in part a to w/v00. Show your work. (Refer to examples shown on next page) c. If you want to dilute the red dye solution concentration in part a by 5 times in a single step, explain in two sentences how you should proceed with the dilution. Additionally, what is the final concentration of the diluted solution? What is predicted absorbance value for this diluted solution? Show your work for the numerical parts of this question. You are only allowed to use a 5-mlL volumetric pipet, a 10-ml volumetric pipet, a 50-ml volumetric flask and/or a 100-mL volumetric flask during the dilution. You may NOT reuse the same pipet during the dilution. Hint: MiVi-M2V2

Answer 1

Absorbance at roau Molar 1.22 Ccm Nat iau all values n CE 9 0-133 xo M

no 4 males Mo C1000mL) 5 looo = 1170, 21 Xlo 100 ml

tims dilulion 2. 5 -S 5 1.33%IO-sena 50ml vo delel al ua 50m mark in volunebue aak elric Li l22cm -2 F1304 X10