If you’ve ever been knocked down by an ocean wave and swallowed some ocean water, you know that it is salty and does not taste good! In many places around the world, obtaining fresh drinking water is a challenge. What if you could turn ocean water into fresh drinking water? And get some salt to season your food at the same time! This experiment will show you one way to accomplish this.
Water (3 cups)
Salt (1 1/2 tablespoons)
1. Make sure all your materials are clean.
2. Dissolve the salt in the water in the mixing bowl.
3. Put the cup in the mixing bowl without letting any salt water get into the cup.
4. Cover the bowl with plastic wrap and seal the edges. Place the small rock on top of the plastic wrap, over the cup, so that the plastic wrap slants toward the cup.
5. Place everything in a hot and sunny area. Water drops should form under the plastic, and the water should drip down into the cup. After a few hours, there should be a sizeable amount of water in the cup. Taste the water – is it fresh or salty?
6. Leave the setup in place until all the water in the mixing bowl is gone. What is left behind?