You can see in the table that many flavors use a mixture of dyes, such as the gr

ID: 1008184 • Letter: Y

Question

You can see in the table that many flavors use a mixture of dyes, such as the grape flavor. If you are concerned about your allowed intake of one or more of these dyes in the mixture, you will have to think carefully about how to adapt the procedure from lab to measure one dye at a time.

1. FD&C Blue 1 dye appears to be blue, as you would likely guess. Based on the color wheel, predict the wavelength where FD&C Blue 1 abs orbs the most light.

2. If you want to measure the concentration of FD&C Blue 1 dye in your grape Kool-Aid using spectrometry as you did in lab, will the FD&C Red 40 dye conflict with your measurement? Why or why not?

3. The molar absorptivity of FD&C Blue 1 is 1.30x105M-1cm-1. Describe the experiment, plot, and property of the plot used to determine this value.

4. To get the right color for grape Kool-Aid, the red and blue colors should appear equally intense. However, on the ingredient list, the Red 40 is listed first, indicating that more Red 40 is used than Blue 1. Explain why. (Hint: The molar absorptivity of FD&C Red 40 is 2.59 x104M-1cm-1.)

In lab, you studied Kool-Aid flavors that contain the red dye, FD&C; Red 40. This is not the only dye that Kool-Aid uses. In fact, Kool-Aid uses a range of dyes, including FD&C; Blue 1 and FD&C; Yellow 5, to get their signature colors. Some of the flavors and the dyes are listed in the table below. Flavor Strawberr Peach Mango Pineapple Green Apple Mixed Be Gra Red 40Blue1 Yellow 5 Overall Color esent Present Present Present Orange Yellow Green Blue Violet resen Present resent Present

Explanation / Answer

1. When a dye reflect a particular color, it will absorb the wavelength of the complementary colour. So,this means the remaining color except the absorbed one is reflected and seen by our eyes. In this case, FD&C Blue 1 dye appears to be blue, it will absorb its complementary colur which according to colour chart is Yellow. So, it will absorb the wavelength range of 560-590nm.

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