Food dyes are everywhere, from food to drink to cosmetics! How much food dye is actually contained in products? In this experiment, determine how much or little of a series of food dyes are added to granular drink mixes to give these drinks their vivid colors. Students use a spectrophotometer to determine the optimal wavelength of absorbed light for each of three FD&C food dyes: red 40, yellow 5, blue 1. Students then develop standard absorption versus concentration curves for each of the dyes. Absorption data for fixed concentrations of drink mix solutions are generated at these three wavelengths. Students then use the data to determine the concentration of each food dye in the powdered drink mixes.
Includes reproducible student handouts, detailed background information, complete Teacher Notes with sample data, and all chemicals and consumable supplies needed to perform the lab.
Complete for 30 students working in pairs.
Additional ResourcesNo Additional Resources at the time.
Flinn Catalog/Reference Manual Page 498
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