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Carolina Investigations® for AP® Chemistry: Spectrophotometric Analysis of Food Dyes

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Carolina Investigations® for AP® Chemistry: Spectrophotometric Analysis of Food Dyes is rated 3.5 out of 5 by 2.
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$5.95 - $18.25 View Details

Addresses AP® Chemistry Big Idea 1 and Learning Objective 1.16. Determine the concentration of food dyes in powdered drink mixes using Beer-Lambert's law. Prepare standard solutions of 2 food dyes, plot calibration curves of absorbance as a function of concentration for each dye, and determine the concentration of each dye in its unknown solution. Procedure does not use toxic thiocyanate salts. For 30 students working in teams of 3.

 
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  • Aligned with Big Idea 1 and Learning Objective 1.16
  • Emphasizes Science Practices 1, 2, 3, 4, 5, 6, and 7

Determine the concentration of food dyes in powdered drink mixes using Beer-Lambert's law. Teach this laboratory experience using either the guided activity or inquiry activity. In the guided activity, students prepare solutions of known concentration for each of 2 food dyes, measure each solution's absorbance, and graph a calibration curve for each food dye. Students then use their data and curve to determine the concentration of food dye in unknown solutions containing a single food dye.

The inquiry activity allows students to design a procedure to determine the concentration of each food dye in its unknown solution. Students must choose the concentrations of the standard solutions that will allow them to interpolate the concentration of food dye in the drink mix and prepare the solutions. It also provides opportunity for students to present their experiment's design and results, reinforcing the practice of communicating findings. Detailed preparation and procedure notes guide you through leading a successful inquiry exercise, including a suggested rubric for assessing student performance.

Both activities include Big Idea assessment questions that follow the AP® Chemistry Exam free-response question format. In the Big Idea assessment, students are given absorbance data for a complex ion, asked to identify the wavelength of maximum absorbance, plot provided data to generate a calibration curve, and determine the concentration of the complex ion.

This kit provides the following AP® Chemistry experiences: design a procedure to collect data; analyze data; perform error analysis; plot calibration curves, and interpolate data from the curves. Because the experiment uses food dyes rather than thiocyanate salts, it is safer and generates no hazardous waste. Materials are sufficient for 30 students working in teams of 3. Digital teacher's manual, included FREE with kit purchase or sold separately, is a 12-month eBook license to the Spectrophotometric Analysis of Food Dyes teacher's manual. You can also access the digital student guide for this kit for free at Carolina Science Online®.

AP® is a trademark registered and/or owned by the College Board®, which was not involved in the production of, and does not endorse, these products.

 
 
 
 
Rated 4 out of 5 by from Easy to follow, caution with the Crystal Light When testing this lab, we noticed that the crystal light packets do not dissolve completely. The resulting solution is a little cloudy, which seemed to impact the results. It was a good point to develop some student conversation though!
Date published: 2014-12-12
Rated 3 out of 5 by from Works, but the dyes included are not the same as the CB Manual While it does address the objectives and works well, it does not align well with the procedures outlined in the CollegeBoard lab manual. For example, the two dyes included are yellow and red and the procedure lists blue. For the schools that purchase the student version of the lab manual and want the labs to be the same, this change will be problematic. Including the red, yellow & blue would greatly enhance the lab in that those instructors who wanted an extension would have it readily available. While I would recommend the kit, I only do so because it works despite not matching the CB Manual.
Date published: 2013-06-28
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