P2 S2 Prep Work Done.docx - Chemical Thinking P2 S2...

Chemical Thinking P2 S2 Preparatory Work v1.4 | 1
Project 2 Session 2 Preparatory Work
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.