Materials List: Acid
(and Base) Rainbows

Parts 1 and 2

Each group needs:

  • 10 clear 6-8-oz. cups or Dixie cups to hold test materials
  • Masking tape and pen (for labeling cups)
  • The following 10 test materials:
    1. Vinegar (2 samples of about 2 tablespoons each)
    2. Lemon juice (about 2 tablespoons)
    3. Tomato or apple juice (pure) (about 2 tablespoons)
    4. Distilled water (2 samples of about 2 tablespoons)
    5. Salt water (2 tablespoons of this mix: 3 tablespoons salt in 1 cup distilled water)
    6. Household liquid bleach (about 2 tablespoons)
    7. Milk of Magnesia (about 2 tablespoons)
    8. Baking soda (about 2 tablespoons in 1 cup distilled water)
    9. Alka-Seltzer tablet
    10. Alka-Seltzer tablet
  • Plus the specific items below, for Part 1 or 2.

Part 1 (only)

Each group needs:

Part 2 (only)

Part 2: Preparation of red cabbage juice for the entire class to share (10 groups):

  • 1 small red cabbage
  • Cold, distilled water
  • Blender (for teacher use only)
  • Fine mesh strainer (or funnel and a few coffee filters)
  • Large pitcher or beaker
  • 10 small jars, beakers or containers (500 ml size, 1 per group)

Alternate Setup: To reduce cost and preparation time, make one sample of each solution and have the students rotate through the samples (instead of each group having each sample). Make numerous water and vinegar samples so that each group has a sample in which to put the Alka-Seltzer. Have each group be in charge of using cabbage juice to test just one of the samples and share data as a class.

https://www.teachengineering.org/activities/view/cub_air_lesson06_activity1