Each group needs:

• eight 5-ounce (~148 ml) paper cups, containing vinegar, lemon juice, milk, 7-Up or Sprite, baking soda, Windex, and red cabbage juice indicator (prepared by teacher, see below), respectively
• 7 pH indicator strips
• Red Cabbage Chemistry Worksheet, one per student

For the teacher (to prepare group materials; instructions in Procedure section):

• 2 red cabbages
• large pot, water, stove, strainer
• pitcher or jug, to hold red cabbage indicator from pot
• marker, to label paper cups
• tablespoon, to measure baking soda
• extra 5-ounce paper cups, to double-up on the Windex cups
• the seven test items (as listed above), enough for all teams