Acids and Bases ~ Using Poinsettias as a pH Indicator.
Fun lab activity for the holiday season!
Many plants, including holiday Poinsettias, contain pigments that can be used as pH indicators. The use of red cabbage is a popular example, but I feel the results obtained from using the pigments in red Poinsettia leaves are even more dramatic than the red cabbage. Take a look at the photos in my preview.
What is the purpose of this lab?
1. The student will prepare a pigment extract from the leaves of the poinsettia plant.
2. Using the pigment extract, the student will establish a baseline of known pH levels.
3. Using the baseline, the student will predict the pH of several household substances.
What materials are needed for this lab?
• Poinsettia leaves
• 250-mL beaker
• 100-mL beaker
• Colored pencils
• Bunsen burner or hot plate
• Test tubes
• Test tube rack
• Known pH buffer solutions
• Lemon juice
• Tap water
• Carbonated drink (Sprite)
• Baking soda
• Graduated cylinder
• Pipets or medicine droppers
Your download pages will include Title, Purpose, Introduction, Safety Precautions, Procedure, Student Data Pages, Follow Up Questions, Answer to all Questions, and Teacher Preparation Notes.
You will receive both an editable Word document as well as a pdf form of the lab.
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