Materials List: Crystalline Cloth:
Modeling Water Treatment Filters

Each group needs:

  • hot plate
  • 250 mL beaker
  • 4 x 400 mL beaker
  • glass stirring rod
  • digital scale/balance (will need to be accurate to 0.01 g for best results)
  • weigh boats (to keep solution off scale)
  • 500 mL (~20 oz.) distilled water (250 mL per day – see Procedure section)
  • 500 g (~20 oz.) pickling salt OR 500 g (~20 oz.) sugar (250 g per day – see Procedure section)
  • teaspoon or small spoon
  • skewer
  • 2 pieces of 6 cm x 12 cm (~2” x 5”) cheese cloth (1 cloth piece per day – see Procedure section)
  • 2 potholders
  • apron for each team member
  • gloves for each team member
  • safety glasses for each team member

Optional (these can improve aspects of the activity, but are not necessary)

  • aluminum foil (to cover experiments, prevent dust)
  • clothespins (if needed to securely attach cloth to skewer)
  • paper clips (if needed to ensure cloth hangs straight down)
  • mason jars (used if students are taking their experiments home)
  • towel (to wrap around 400 mL beaker to help the solution cool slowly and improve crystal growth; only needed for a few hours)

For the entire class to share: