Determination of Purity of Food Colours Using Paper Chromatography

This Determination of Purity of Food Colours Using Paper Chromatography lesson plan also includes:

Is food color pure or made up of multiple colors? The fifth experiment in a series of seven encourages scholars to identify the color components in food coloring. They use paper chromatography to identify which colors are present and their Rf values.

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CCSS: Adaptable
Additional Tags
Instructional Ideas
  • Extend the lesson by making tie dye circles on shirts
Classroom Considerations
  • Follow all safety procedures with rubbing alcohol
  • Be sure not to touch chromatography paper without gloves as the oils and dirt may alter results
  • Know all student allergies since red food dye is becoming a more common allergy
Pros
  • Highlights the equation every time it is required
  • Diagrams clearly explain how to set up equipment properly
Cons
  • None
Common Core