Friday, November 2, 2012

Science Experiment: Salt Water Evaporation

This is an easy experiment that we did while rowing How To Make An Apple Pie And See The World.

In the story, the little girl collects saltwater from the Atlantic Ocean. She takes it home, sets it out in the sun to evaporate the water, and uses the leftover salt in her apple pie.

We evaporated some salt water too with some impressive results.

Materials You Need:

  • a sunny day :)
  • 1 or 2 cups water
  • 2 tbsp. salt
  • 1 piece black construction paper
  • baking sheet with a lip around the edge (or shallow baking pan)

  1. Combine salt and water. Stir until thoroughly dissolved.
  2. Lay black paper in baking sheet.
  3. Pour water over paper.
  4. Set out in a sunny spot for several hours.
  5. Ask your students to predict what will happen to the water and the salt.
  6. Anchor the paper down on the baking sheet with a couple of small rocks if it's a windy day. Check the paper after several hours to see what has happened. The water should be evaporated, and all of the salt crystals should be visible in the black paper. 
  7. This is a great opportunity to discuss Evaporation and The Water Cycle.
  8. You can use this booklet from The Notebooking Fairy to record your experiment and results.

Hope you enjoy this experiment as much as we did!

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