Poinsettia Power
Poinsettia Power
Chemical Concepts:
• indicators
• pH
Materials:
poinsettia flowers
600 mL beaker
hot plate
filter paper
.1 M HCl
vinegar
baking soda solution ( 2 g / 200 mL water)
.1 M NaOH
scissors
funnel
toothpicks
4 watch glasses
Procedure:
1. Cut flower petals into strips allowing pieces to fall in beaker. Do not handle cut flower pieces.
2. Add 10 mL water. Simmer until color is removed from flower petals.
3. Filter into plastic storage bottle.
4. Place clean filter papers on a tray or in petri dishes. Saturate filter paper with the poinsettia solution. Allow filter paper to dry.
5. Place small amounts of each solution in a different watch glass.
6. Using a toothpick, dip in the solution and draw a holiday object on the filter paper.
Safety:
Check the MSDS for precautions and disposal.
Adapted from The Center for Applied Research in Education, 1994
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