P2 S2 Preparatory Work (1).docx - Chemical Thinking P2 S2...

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Chemical Thinking P2 S2 Preparatory Work v1.4 | 1 Project 2 Session 2 Preparatory Work Your TA’s name: Your name: Lab section: Your email: Write an initial experimental plan to identify the FD&C food dye(s) present in your assigned commercial candy sample. There are several points you should consider in your experimental design. First, the spectrophotometers in lab produce absorption spectra ( A vs. λ plots) for a substance in solution in one straightforward reading. Second, such absorption spectra ( A vs. λ plots) typically have a wavelength of maximal absorption ( λ max ), which is considered a differentiating characteristic for the substance. This means λ max can, in theory, be used to identify substances. In lab, you will have access to stock solutions of all seven FD&C food dyes. Your task is to devise an experimental strategy and write out a procedure, in outline form, that identifies which FD&C food dye(s) are responsible for imparting color to the candy your group has been assigned to.

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