Each group needs:

• 4 small clear plastic cups
• 2 straws
• 1 spoon
• Breathing Bubbles Worksheet

To share with the entire class:

• water
• red cabbage indicator solution (Instructions: Chop a cabbage into small pieces and steep in boiling water for at least 10 minutes. Then, filter out the cabbage pieces using a coffee filter or tea strainer. You should be left with a bluish/purple solution at neutral pH.)
• 4 clear different solutions to measure pH (examples: diluted lemon juice and/or vinegar, baking soda mixed with water, water, soda pop, etc.)
• pH meter (if available) or pH paper strips (optional)
• plastic gloves (optional)