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A. Characterization of Standard Food Dyes.
Rf = Ddye / Dsolvent
WARNING: UV light can damage your eyes. Always point lamps away from you. Do not look into the UV lamps
B. Separation and Identification of Dyes Used to Coat M&M Candies.
Do the M&M candies contain any of the standard dyes above? To begin to answer this question, take one M&M of each color to the UV lamp and see if they fluoresce. Note the color of any fluorescence you observe in your notebook.[Three pairs of students will share making two solutions each.] To separate the dyes used to coat M&Ms, you must first prepare a solution of the coating dyes. To do this, place 4 M&M's of the same color into a small beaker. Add 3 mL of a 50/50 mixture of water and ethanol and swirl the solvent until the candy coating has dissolved. Remove the M&M's from the solvent before the chocolate center is exposed. You and your partner may coordinate with two other pairs of experimenters so that each pair only has to prepare 2 solutions that can be shared with the group.
Prepare a second chromatogram like that in Part A using the 6 M&M solutions. The dye solutions prepared with the M&M candies are not as concentrated as the solutions of the standard dyes. You will need to spot these dye mixtures several (>5) times to obtain a sufficiently dark spot. [7-9 times may be necessary] Again, dry each spot between applications of the mixture to maintain as small and concentrated a spot as possible.
Develop the chromatogram. Characterize the Rf value, color, and fluorescence characteristics of each dye observed. Remember that unlike the previous chromatogram, you are now separating mixtures of dyes and there may be as many as four components each with its own Rf value, color and fluorescence characteristics. Use all three characteristics to identify all components found in each M&M coloring.
If 7.85 x 10 to the 24th power Sc atoms react with excess CaO, how many grams of each product will form? You will need to determine the equation of the reaction.
The mass of solute per 100 mL of solution is abbreviated as (m/v). Mass is not technically the same thing as weight, but the abbreviation (w/v) is also common
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