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Desalination Experiment

Here’s a really easy science experiment to do with your kids that will make you feel like a hero-mom after just five minutes of prep-work…try desalinating water. This is a project my kids and I tried on Tuesday this week, as part of our A STEM Summer adventures. Our theme for week 1 is Oceans, so this was a good fit.

What you do is mix water and salt in the little bowl. Then you dump the salty water into the big bowl, and clean out the little bowl.

Place the little bowl inside the big bowl of salty water and cover the whole thing with plastic. Put something heavy (like Grandma’s broken watch from the dress-up box) in the center of the plastic. Place the whole contraption out in the sun and wait.

Confession time. Here’s where we had to totally cheat. Tuesday, July 3rd was so cold where we live that the furnace turned on, I was wearing fleece, and we had to fudge a bit with the “put the bowl out in the sun” part of the experiment instructions. Instead, we heated up the salty water in the microwave and then put the plastic back on. This time, the experiment worked!

By the way, you can of course use a rock instead of an old broken watch.  We were just pretending to be castaways on a dessert island.  :)


2 Comments

  1. Mrs. Warde says:

    Oh good, I am so glad you posted this! Builder Boy will LOVE it!

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