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

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Chemical Thinking P2 S2 Preparatory Work v1.5 | 1 Project 2 Session 2 Preparatory Work Your TA’s name: Your name: Lab section: Your email: Write an initial experimental plan to determine the molar absorptivity ( ε ) of the FD&C food dye(s) present in your assigned commercial candy. From the identification experiment planned in your P2 S1 Preparatory Work , you should know the dye(s) present. You cannot use the isolated dye(s) directly to find ε , for the concentration is unknown – in fact, you will eventually seek this concentration. However, you will have the previously mentioned stock solutions of pure dye for which the concentration is known (seven stock dye solutions, one for each of the seven FD&C dyes). Thus, to find the absorbance-concentration relationship, the stock dye solution(s) must be used. Incorporating the appropriate

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